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AOC Craft Vietnam JSC

Some concepts about Fretwork

Fretwork is an interlaced decorative design that is either carved in low relief on a solid background, or cut out with a fretsaw, coping saw, jigsaw or scroll saw. Most patterns in this field are geometric in design. The materials most commonly used are wood and metal. Fretwork is used to adorn furniture and musical instruments. The term is also used for tracery on glazed windows and doors. It is also used to adorn/decorate architecture, where specific elements of decor are named according to their use such as eave bracket, gable fretwork or baluster fretwork, which may be of of metal, especially cast iron or aluminum.

To make it simple, fretwork is the “inside cuts” in the design, mostly in wood, but can be done on anything that can be cut



1, Fretwork through in 3000 years

The art of fretwork began more than 3000 years ago with fretted inlays on furniture in Egypt.  It has been popular in North America and Europe from the mid 1800’s until today.  Fretwork of the 1800’s and early 1900’s was done with hand fretsaws or foot-powered scroll saws.  In the 1920’s several scroll saws were designed for use with electric motors. 

The evolution of the scrollsaw is linked to the rise in popularity of fretwork (the sawing of intricate shapes from wood). Although there are examples of fretwork-like decorations on early Egyptian, Greek, and Roman furniture, these were probably carved or cut with a knife. It wasn’t possible to saw delicate wooden shapes until the late 1500’s, when a German craftsman (possibly a clock maker) devised a method for making fine, narrow blades.

In 1974 Helmut Abel of Germany started building the Hegner line of scroll saws which started a new popularization of fretwork as a hobby.

Fretwork was introduced to America in the mid-1800’s as Sorrento wood carving , so named because of the area in Italy that it was most popular. By the 1860’s, the first mechanical fret saws – called scroll saws – began to appear in the U.S. And so a great art form and hobby were born. Today there are over fifty models of scrollsaws available with many options.


2, Pattern of fretwork- The essential part:

Fretwork was a very popular hobby at the turn of the XX century, in fact those were the golden days of the hobby, patterns were produced and sold in great numbers and quality, not only in Italy, but in many western countries. “We always have the whole collection of patterns available, because the patterns are constantly reprinted. Many of these designs have reached 65 editions in a short time (65,000 copies). The number of patterns sold  until December 1905 is 5,932,400” said Pietro Barelli, an Italian businessman. Besides him, there are many other fans of this hobby who had a great deal of pattern. For instance, in October 1895, Hobbies issued its first number of weekly Hobbies magazine which contained an impressive collection of fretwork patterns, clocks, coffers, shelves and many other decorative items. At the beginning of the XX century, it sold many copies of the magazine, hundreds of thousand for sure, maybe millions. In addition, some people like Bowman, Russell, Wild were well-known scroll saw designer in the USA. In Italy, there were Amati, Ettore; in France there was Joubert-Tiersot,.etc.

Here is some samples of pattern


3, Process:

Firstly you obviously need wood, solid wood is ussually preferred but it’s a bit hard but it’s long lasting. Or you can use plywood (of which the edges are obviously less desirable thhan those of solid one, fine hardwood plywood such as teak, cherry, walnut, mahogany, maple…) or other modern materials.



The entire process of fretwork revolves around the technique of making inside cutouts of various designs. This is known as piercing work. First, you drill holes into the waste, or area that will be cut away; then you thread the blade through, reclamp and retension the blade in the saw, before proceeding to complete the cutout. Repeat this process as many times as necessary to finish the project.


Fretwork patterns originally were ornamental designs used to decorate objects with a grid or a lattice. Designs have developed from the rectangular wave Greek fret to intricate intertwined patterns. A common misconception is that fretwork must be done with a fretsaw. However, a fretwork pattern is considered a fretwork whether or not it was cut out with a fretsaw.


4, Fretwork by machine:


Computer numerical control (CNC) has brought about change in the method of timber fretwork manufacture. Lasers or router/milling cutting implements can now fashion timber and various other materials into flat and even 3D decorative items.

Some-concepts-about-Fretwork-19 Some-concepts-about-Fretwork-18

Draw ceiling lamp for wood cutting

Draw ceiling lamp for wood cutting

Draw ceiling lamp for wood cutting

For more tutorials, videos or patterns, please follow and check out website at
Our website supply information about the cutting art, wood or paper cutting, free patterns or tutorials for DIY wood/paper cutting. Besides, you can find some articals for design with graphic software (as Coreldraw, photoshop, sketchup, blender….)

AOC Craft

Draw ceiling lamp for wood cutting

wood cutting

Software: Sketchup


 – Curve: Draw curves

 – Push: Change object’s thickness

 – Array: When you move or rotate an object, you can copy it by press number and x or / (exam 5x, 5/ …)


First, start with rectangle. I always with a rectangle, to make a face and then I can draw everything on this face with draw tool as curve, line or freehand…

Use curve to draw a curve on that face to make a rail of lamp


Beacau the rail mirror then I only draw a half and then copy and flip it.

Then I make that rail to a component (press G – defaul). If I make a component, then I can fix one object for all the same components copy.

Draw a circle to hold the rails


Push the rail with high same thickness wood


Rotate and copy the rail component: Choose the component, then use rotate tool (Q) to rotate it, with center at center of the circle. And depend angle of rotate, you can multply or divide to copy components.

Exam: If you want to rotate 12degree, and copy to 30 component (for 360degree of all) , you can do 2 ways:

– Rotate 12 degrees and hold Ctrl to duplicate, then press 29x (multiply)

– Rotate 360 degrees and hold Ctrl to duplicate, then press 29/ (divide)




Push the holding circle with the thickness of wood


Scale to make the lamp as you want


Test lampshade: You can creat a light bulb to render and test shading

– Creat a Light bulb


– Apply material and texture for lamp


– Render to test shading


When you feel everything ok, comeback sketchup and export rails, holding circle to vector file, prepare pattern for wood cutting (by CNC, laser machine, or by scroll saw, carving wood…)

Full video for ceiling wood lamp drawing, please watch

For more tutorials or free pattern paper/wood cutting, please visit our website

Some materials in fretwork and marquetry (part 2)


2. Woods

Although any kind of wood may be used by the fretcutter, certain of them are more likely to be met with than others, and a short description of the principal will be useful. Only those which can be easily obtained, either from an ordinary timber dealer or from fretwork specialists, are mentioned. Many of them, being used in the construction of ordinary articles of furniture, can be obtained at a cabinet-maker’s if there is no timber yard available.


Ash — Coarse in grain, with large figure, without much variety. Hard and tough. The colour varies from a light yellow to a light brown. The Hungarian variety is very different from the ordinary, being full of figure and of a different colour. It is generally used in the form of veneers and is not a pleasant wood to cut.

Beech — A fine, close-grained, hard wood, mostly of a lightreddish-brown colour, though some of it is nearly white. It is a nice clean-cutting wood, and polishes well either in its own natural colour or stained.

Birch — A similar wood, but with a much finer figure in the choicer varieties.

Cedar —  The ordinary variety is the material of which cigar boxes are generally made, and may often be confounded by the novice with mahogany, which it to a certain extent resembles. It is coarse in the grain, without much figure, and moderately soft. It must not be mistaken for the fragrant variety known as pencil cedar. This is a very soft silky wood without much figure, close grained, and pleasant to work, but is easily split.

Canary — This, as generally sold for fret purposes, is a soft American wood often simply called whitewood, but of a yellowish tinge. It is remarkably free from knots and there is practically no figure. It cuts well and easily.

Cherry — Close grained, hard, light reddish-brown in colour, and very suitable for fine work.

Chestnut — There are two distinct varieties, one of them being the timber of the Spanish or eating chestnut tree, and the other of the horse-chestnut tree. The former bears a great similarity to oak. It works well and freely. The wood of the horse-chestnut has very little figure, is close and soft, and is of a light colour, much of it being almost white. On this account it is often useful as a substitute for holly.

Ebony — Ebony wood dyed black is generally used instead of real ebony, which is not a pleasant wood to cut, being very hard and troublesome in other respects. Very little ebony is absolutely black.

Holly — This wood, as prepared for the fretcutter, is chiefly American, and is of a beautiful creamy white, closely resembling ivory. It is hard and close grained, with little figure. This latter feature along with its colour are the characteristics which render it of value to the fretcutter. White chestnut, or the finer kinds of sycamore, may be used as substitutes. It should not be polished or varnished, as treatment of this kind destroys the purity of its colour. This being so delicate is apt to become dirty when handled during working, but may be restored by rubbing on a little whiting with a soft rag or cloth.

Lime — Light coloured and in general features resembles holly, but is softer and not so white. American lime tree is often called bass or American whitewood, and under this name can be obtained at many timber yards. It is very clean and free from knots.


Maple — A light yellowish-brown wood, hard and close grained, without much figure in the plain kind. ” Bird’s Eye ” maple, on the contrary, is distinguished by the richness of its figuring. It owes its name to the peculiar configuration of the small knots which form the centres of the markings. It is generally used in the form of veneers ; it is not a pleasant or easy wood to cut with the fretsaw.

Oak — Though hard, this is by no means an unpleasant wood to work, and for many articles is to be preferred to any other. There are many varieties. Without detailing these, it may be sufficient to say that American oak as a rule is the plainest, while the better kinds are known as Dantzig, Riga, wainscot, etc. In colour oak in­clines from a, light yellow, almost white, to a dark brown, and is generally distinguished by dealers in fretwork woods simply as light or brown. The finely figured variety, known as pollard oak, is not suitable for using except as veneers. As oak is a wood that can easily be stained to a darker tint than the natural one, like coloured wood it is more useful than the brown. Light oak, being very easily darkened by ammoniacal vapours, should not be kept in a stable or where it is subject to such fumes. This tendency in oak is taken advantage of to darken it by what is called fumigation, a most useful process as the wood is not roughened as it is when a liquid stain is applied.

Mahogany — This wood is too well known to need much des­cription. It is an admirable material for the fretcutter or any worker in wood, as it cuts well and cleanly, is susceptible of a very high degree of finish, and in the choicer sorts is beautifully marked. These, on account of their value, are principally used in veneers. There is probably no wood in which so much variety is found as in this, and there is a corresponding range in the prices charged for it. The plainest and softest is Honduras mahogany, frequently called baywood. Some of it is fairly well figured, but as a rule it is plain and of only a moderate hardness. It is very suitable for general use, either for fretting in the solid, or as a foundation on which to lay the more choicely figured veneers. Spanish mahogany is harder and of better figure. The term ” Spanish ” is of very wide application, and if some other kind which may not be strictly Spanish is equally as good in figure the exact place of growth is not a matter of importance.

Olive — Of a light yellow-brown colour, finely variegated with darker markings, is hard, fine in grain, easily worked, and takes a good polish.

Pine — Though looked upon as a common wood, there is no reason why it should not be more largely employed than it is by the fretworker, for it is by no means without a beauty of its own, while it is both easy to work and inexpensive. As there are many

varieties of pine, it may be well to say that common spruce which is full of knots is not so suitable as the yellow or red pine, which can often be obtained in nice, straight-grained, clean pieces. If left ” in the white ” or unpolished it looks very well, and by be­coming darker improves in appearance with age.

Pitch Pine — Pitch pine is a distinct variety, much harder and more decidedly figured than the ordinary kinds. As it contains a large quantity of resin it is not a pleasant wood to cut.

Rosewood — Like the last and for the same reasons this is also somewhat difficult to saw, especially as it is hard and close in texture. In colour it varies from a dark red to brown with strongly marked darker figuring. Genuine rosewood is fragrant, but this characteristic is absent in many varieties, almost exactly the same in appearance, which have found their way into the market. If used for its smell the wood should preferably be left unpolished.

Sycamore — A very clean, nice-working wood, tolerably hard, and varying in colour from almost pure white to a dirty brown tinge. It is close in grain, and when white is an excellent substitute for holly.

Satinwood — This is a beautiful yellow wood, often finely figured with smooth lustrous markings after the style of choicemahogany, which it resembles except in colour. It has anagreeable odour, and though hard is pleasant to work.

Sequoia or Californian Red Pine — This is the softest wood known, but it is not altogether a satisfactory one, as it easily splits, so that it is quite unsuitable for fine delicate work. In appearance it is not unlike pencil cedar, but has none of its fragrance. As a substitute for pine itmay be used for drawer sides, etc., the backs of cupboards, and inside work generally. Its chief advantages are that it is verystraight in the grain and free from knots. Being soft and cheap, it is a good wood for the beginner to practise with.

Walnut — Black or American walnut is the most suitable for the fretcutter. It is hard but pleasant to work in, being generallyfree from knots and evenly grained. The beautifully figured variety known as burr or Italian walnut is used only as veneers.

This list by no means exhausts the kinds of wood that may be used or met with, and it might be almost indefinitely extended by naming those which are of comparative rarity or not so generally used by the fretcutter. 

Yew — Yew is a finely marked, close grained wood, in colour varying from a pale yellowish orange to a reddish tint with dark small markings or knots almost black in colour. It is tough and hard and cuts cleanly.


The appearance of polished or varnished wood is different to some extent from what it is when the wood is in the natural orunpolished state. As a rule the depth and richness of thecolour is increased. In the absence of a polished piece, the appearance can be judged very closely by wetting the surface of the wood with water. While the gloss caused by this remains it may be compared to polish.

All kinds change in appearance with time, most of them getting darker ” as the years roll on.” A few of the more brightly coloured ones, such as tulip wood, fade.

In addition to those woods which have been named as generally used in the form of thin veneers, there are many others which are used principally in this state, and a brief enumeration of some of the principal will be useful. As veneers they cannot be used except for inlays or overlays, as they are not thick enough to form anything of by themselves. Both these forms of fretcutting will be treated of in due course, but it may occasionally happen that the cutter wants to do something in a choicer wood than he can obtain in the solid. In this case, the only way is to mount the veneer beforehand on a solid piece of the necessary thickness, and then proceed to cut it as though it were an unveneered piece of board. If the board is veneered on both sides it will be almost impossible, except by the closest examination, to see that it is not cut out of a solid piece. By this means a considerable saving in the cost of material may often be effected, and, as already sug­gested, it is the only way in which some veneers can be vised for plain cut through frets. In order that the edges may not betray the fact of a board having been veneered, it is necessary that the foundation and the veneers should be of the same kind of wood. Thus, if a choice Spanish veneer is being used, let it be mounted on a piece of cheap plain Honduras. The endeavour must be to have the foundation of the same colour as the veneers. If this cannot be managed, the edges must be afterwards stained. As the process of laying veneers is a difficult one without a good deal of experience, the best way for the amateur to do in such cases is to enlist the services of a cabinet-maker who is con­versant with the work.

<To be continued>

<Source:  Fretwork and Marquetry, D. Denning, 1895 >

Some materials in fretwork and marquetry


1. Introduce

The principal material used by the fretcutter is wood, and he should attain skill in cutting this before using others either more difficult to work or more costly. Among the other materials may be mentioned brass, and the softer metals, mother of pearl, vulcanite, xylonite, ivory, etc. Wood is the material for which most of the published designs are prepared. There is amplescope in this one material alone. He can choose wood nearly white, or, if he prefers it, black, for ebony is nearly so if not quite, or he can have wood dyed in a variety of colours. A few of the chief characteristics of the various kinds of timber most commonly used will be useful, as well as a few hints about buying wood, and the way in which it is specially prepared for the fretcutter.

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Wood may be bought at the ordinary timber yards, but many of the fancy varieties are not always to be met with in this manner and it is rarely to be got of suitable thickness. Generally the timber merchant does not care to cut a board, so that the purchaser is compelled to take more than he requires. Naturally the prices at the timber yard are less than those quoted by dealers who will cut any size required. To do this means waste, for which the dealer must be recouped. Those who buy in large quantities will find that a considerable saving is to be effected by going to a timber yard for what they want. On the other hand, they will seldom be able to get the wood planed smooth at a timber yard, as it will be rough from the saw. This, however, is not a very serious objection, as if the fretcutter does not care to do this work himself he can get it done for him by any cabinet-maker. When purchas­ing wood it is necessary to be careful to select well-seasoned dry stuff, and if it is got from an open timber yard it is very likely not to be dry, although it may be thoroughly seasoned. Timber should be kept in a warm dry room for a time before it is used, but on noaccount should any attempt be made to hasten the drying by placing it too near a fire. If this is done the wood is very apt toshrink, split, or twist. As it is not an easy matter to judgewhether wood is seasoned or not, although there are certain signs by which an expert can generally tell, the best plan for the amateur is to deal only with a reliable merchant to whom the selection may be left. Wood specially prepared and sold by dealers in fretwork materials may almost invariably be depended on for being dry and well seasoned.


Boards are not always so flat as they ought to be. When a board is really badly twisted it will seldom be of much use wasting time over it, as it rarely happens that any improvement can be effected except by planing it down, and in the case of thin boards there isnot enough stuff to allow of this being done. It often happens that a board has become rounded or convex on the one side and concave on the other. In this case it is often possible to flatten the wood without much trouble. Wood on being damped swells, consequently if wetted on one side that becomes convex and the other correspondingly concave, or to use the more usual workshop term, it is rounded on the one side and hollowed on the other. If the hollowed side be equally damped it will in its turn swell, so that the board again becomes flat, and if both sides are dried equally it will remain so in all probability. In practice it is not a good plan to damp wood more than can be helped, so the hollow side is rarely wetted, but the converse plan of drying the rounded side is adopted. This may be managed by placing it for a short time near the fire, but not too near or it may split or curl thereverse way. It is impossible to give precise directions, as so much depends on circumstances. Occasionally it may even be preferable to swell the hollow side by damping it, and very little moisture is required to effect what is necessary. Where there is plenty of sawdust about it is not an uncommon plan to moisten a few hand-fuls of this and to let it lie on the hollow side of the wood for a few hours. Boards may often be flattened by simply laying them down on a cold floor with the hollow side downwards, or by placing them against a wall. In every case the principle of swelling the hollow side or shrinking the rounded one is the basis on which boards are treated, unless it is necessary to plane them down.


Wood in such quantities as the amateur is likely to require is sold by the square foot, except a few varieties which are generally sold by weight. Wood being sold and quoted for per square foot may mislead the novice by inducing him to suppose that if he orders a foot or any number of feet he will get a piece one or several feet square. The superficial measurement is taken in calculating the number of feet the board contains, thus a board 2ft. long by 6in. wide is only 1ft., the same as one measuring,12in. by 12in. When ordering wood, more than the actualquantity apparently required must be got, as it is impossible to work it up without some waste. The amount of this depends on the job, and the cutter will soon learn to estimate it with a sufficient amount of accuracy. If more is got than is required for a special article, the odd pieces which are left over will very likely come in handy for making up some small thing, so unless very small they should not be thrown away.

The wood that is specially prepared for fretworkers is generally in certain definite thicknesses, and these are 1/8, 1/4, and 3/4 in. In addition to solid wood in these thicknesses, what is known as 3-ply wood is also prepared, each board being made up of three veneers with the grain of the middle one in the contrary direc­tion to that of the outsides. From this arrangement the 3-ply boards are less likely to twist or split than when in the natural state. They are also much stronger, and on that account are to be preferred to solid wood for fine, delicate work. The 3-ply is not obtainable in greater thickness than Jin. It is always sold planed and finished, ready for use.


While speaking of the thickness of wood, it is usual to speak of wood by its nominal thickness. This remark hardly applies to specially prepared fretwood, which is often sold at its actual thickness. When wood is got from the ordinary timber yard, the purchaser should be careful to explain whether the thickness he wants is the nominal one or the thickness ” down,” which means after the wood has been finished smooth by planing ” down.” The reason for boards not being of their nominal thickness may be explained in a few words. If an inch board, that is, one an inch thick, is divided into four, each piece is nominally Jin. thick. Actually these boards are less, as the saw cuts or kerfs have removed some of the wood in the form of sawdust. The wood being rough from the saw is further reduced in thickness by smoothing.

Wood is also sold in the form of veneers, which are very thin, so that they cannot be used by themselves, but have to be stuck on to a solid foundation or ground. Veneered fretwork is generally used in the form of inlays or overlays, both of which will be explained in due course. To the marquetry-cutter they are essential, as all marquetry is done with them. Veneers are prepared in two different ways, known as knife-cut and saw-cut. The former is very thin, though cheaper it is not so suitable for the kind of work under consideration. It is merely mentioned to put the purchaser in a position to know what kind of veneer to get. The ordinary saw-cut veneer is in every way better for working with. The value of most kinds of wood varies according to the choiceness and variety of its figure or markings. Some woods, however, such as holly, depend a great deal more on their purity of colour and absence of figure. These, however, are theexceptions. <To be continued>

<Source:  Fretwork and Marquetry, D. Denning, 1895 >

Design a wooden box in sketchup

wooden box

Hi everyone,

Do you like to take or give a wooden box? And do you want to design a box by yourself?

In this article, I’ll show you the way to design a simple wooden love box in sketchup, for cutting and carving wood. I use original sketchup without plugin.


– Curve (A) to draw curve

– Rectangle (R) to draw rectangle or square

– Line (L) to draw line

– Push (P) to push or pull / extrude object.

– Material (B) to apply material (color, texture…)

First, Draw lid of box : draw rectangle, and subvide it to 2 part (Next steps we’ll do on a half and mirror after that.)

Design-a wooden-box-in-sketchup-1

Using Curve tool (A) to draw a half of stencil heart (random as you want)

Design-a wooden-box-in-sketchup-2

Duplicate half of heart (Hold Ctrl when move it) and flip it, then put two half together, erase some edges, we have a heart

Design-a wooden-box-in-sketchup-3

Pust the face above with a thickness wood we’ll use, we have a lid piece wood with a cutting heart

Design-a wooden-box-in-sketchup-4

Make carving letter with 3D text (Tool / 3D text) and type your text, extrude of text thinner than lid. Then put above faces of text on above faces of lid, and erase these faces on text

Design-a wooden-box-in-sketchup-5

We have a lid box with carving letter and cutting heart.

Continuous with body box: Draw length and width pieces along corner of lid, then push them to heigh body

Design-a wooden-box-in-sketchup-6

Design-a wooden-box-in-sketchup-7

Make mountain rails to hold lid with body

Design-a wooden-box-in-sketchup-11

Design-a wooden-box-in-sketchup-8

Draw bottom of box : a rectangle piece with dimension same lid

Design-a wooden-box-in-sketchup-9

Export pattern when finish steps above. This pattern for rate size: 100x150x250 mm, 12mm thickness wood

Design-a wooden-box-in-sketchup-10

The result in sketchup

Design-a wooden-box-in-sketchup-12

And real:

Design-a wooden-box-in-sketchup-13

You can watch full tutorial in this video:

Hope you can make a wood box in sketchup or real with this article.

For more tutorials, videos or patterns, please follow and check out website.

Our website supply information about the cutting art, wood or paper cutting, free patterns or tutorials for DIY wood/paper cutting. Besides, you can find some articals for design with graphic software (as Coreldraw, photoshop, sketchup, blender….)




Design table lamp flower in sketchup

Design table lamp flower in sketchup

Sketchup is a 3D sofware, it’s very easy to use, but can creat complicate model. I usually use it to modeling pop-up cards, or wood cutting model. Today, I’ll show you the way a wooden lamp is created in sketchup. First, creat a polygon ( the number of edges as you want), here I creat a polygon with 20 edges (press 20s and enter after draw a circle). On each edges, creat a curve, you can make a shape as this: Tutorial-design-table-lamp-flower-in-sketchup – Delete polygon and contour (F shortcut) for this Tutorial-design-table-lamp-flower-in-sketchup-1 – Make group for parts of it. Each part is a wooden peice after. Tutorial-design-table-lamp-flower-in-sketchup-2 After group a part for all of them, we put them together as beginer. Then we put each part with high as wood thickness Tutorial-design-table-lamp-flower-in-sketchup-3 Tutorial-design-table-lamp-flower-in-sketchup-4 Move parts and rotate them to creat a lamp shades Tutorial-design-table-lamp-flower-in-sketchup-5 Tutorial-design-table-lamp-flower-in-sketchup-6 Tutorial-design-table-lamp-flower-in-sketchup-7 – Creat body lamp : Draw trunk and leaves by using curve tool ( A shortcut): Tutorial-design-table-lamp-flower-in-sketchup-8 Tutorial-design-table-lamp-flower-in-sketchup-9 Divide many layer and put on as wood thickness


Creat foot and apply texture, check the model Tutorial-design-table-lamp-flower-in-sketchup-11 Finish modeling, try to make it by wood cutting, and this is result, a wooden table lamp make by solid Melanorrhea laccifera Pierre wood, 12mm thickness. Table-lamp-LA020615-4 You can watch video below for full design in sketchup. If u have questions, please contact us for more informations.

For more tutorials, videos or patterns, please follow and check out website. Our website supply information about the cutting art, wood or paper cutting, free patterns or tutorials for DIY wood/paper cutting. Besides, you can find some articals for design with graphic software (as Coreldraw, photoshop, sketchup, blender….)