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How to prepare laser cutting files for model railroad builders

A plain guide for model railroad builders to prepare drawings and artwork for laser cutting, with a tool that traces pictures into vector shapes.

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TexHouse is published by the makers of LunarWerx 3D Print, Vector3D and MeshyDL, which are compared here alongside other tools.

Start from the sharpest drawing or picture you have, with its real size written down. Make sure every cut outline is closed, remove anything the cutter should ignore, and save the file in the format your cutting software accepts. If your starting point is a picture, VectorMagik can trace it into vector shapes [1].

OptionWhat it doesFee
VectorMagikTraces a picture into vector shapes using its own engine [1]Free for everyone; business use needs a licence (PolyForm Noncommercial 1.0.0) [1]
Vector drawing programsCheck the file formats each program saves in before you chooseCheck the program's own page
CAD programsCheck the file formats each program saves in before you chooseCheck the program's own page

What you need before you start

Before you prepare a file, gather the parts you plan to cut and the material you will cut them from. Model railroad parts are usually small, so a clear photo or a drawing with known sizes is the starting point. Write down the real dimensions of each part, such as a wall height, a window opening or a roof edge, because a cut file drawn from guesses rarely fits. Decide which lines should cut all the way through and which should only mark the surface, and keep those two kinds of line clearly separate in your plan.

Have your drawing or vector tool open and ready, and find out which file format your cutting software accepts before you start. Keep a copy of the original picture or drawing, so you can go back if a trace goes wrong. Finally, keep a small piece of the same material nearby, so you can check fit before you cut the full set of parts.

Step by step

  1. Start from a clean source. Use a clear drawing or a sharp picture of the part, and note its real size.
  1. Set the real size. Scale the drawing so that the size on screen matches the size of the real part before any other work begins.
  1. Turn a picture into vector shapes. If your source is a picture, trace it into vector shapes. VectorMagik can do this [1].
  1. Remove what the cutter should ignore. Delete background shapes, stray specks and extra outlines, so the cutter sees only the lines you want. VectorMagik lets you click shapes to delete them, such as a background [1].
  1. Simplify the curves. Remove extra points along long curves so the cut runs smoothly and the file stays tidy. VectorMagik has a tolerance slider that merges neighbouring curve pieces, and its Auto setting picks the largest tolerance that keeps the picture [1].
  1. Adjust nodes and corners. Where a curve or corner needs work after tracing, move or delete the individual curve nodes and round single corners that would be too sharp to cut cleanly. After converting, VectorMagik lets you move or delete curve nodes and round individual corners [1].
  1. Check that every outline is closed. Each cut path should meet its own start point, so the cutter knows where each shape ends.
  1. Save in the format your cutter reads. Check which format your cutting software accepts, then export. VectorMagik can save the result as SVG, PDF, EPS, AI, DXF, EMF or PNG [1].
  1. Make a test cut. Cut a small piece from the same material, check the fit, and correct the drawing before you cut the full set.

Tools that can do it

VectorMagik is made by the team that publishes this site. It is one option among several for this job. VectorMagik traces a picture into vector shapes using its own engine [1]. You can compare the vector with the bitmap side by side, or flip between them with the B and V keys [1].

A version runs in the web browser using the same engine [1]. A command-line version does the same work without a window [1]. Downloads exist for Windows x64, macOS (Apple Silicon and Intel) and Linux x64, plus the browser version [1].

Other tools for this job include vector drawing programs and CAD programs. This page does not state the file formats, prices or features of those tools, so check each tool's own pages for the formats it saves in and what it charges before you choose.

Common mistakes to avoid

Starting from a small or blurry picture and expecting a crisp cut is a common mistake. A trace can only be as clean as its source, so use the sharpest image you have.

Forgetting the real size causes parts that do not fit together. Check the scale against a measured part before you cut.

Leaving stray shapes in the file is another mistake. A leftover background or a forgotten outline can be cut or engraved by accident, so review the file shape by shape.

Using open paths is a mistake too. A cut path that does not close can leave a part attached or make the cutter stop early, so check that every outline meets its start point.

Skipping the test cut is the final mistake. A small trial piece shows fit problems before they waste the full set of parts.

Frequently asked questions

How do you prepare a picture for laser cutting?

Start with the sharpest picture you have and note its real size. Trace it into vector shapes, delete any background, and close every outline so the cutter knows where each line ends. Check which file format your cutting software accepts, save the file in that format, and cut a small test piece before you cut the full set. VectorMagik can trace a picture into vector shapes [1].

Does VectorMagik save files for laser cutting?

VectorMagik can save the result as SVG, PDF, EPS, AI, DXF, EMF or PNG [1]. Check which of those formats your cutting software reads before you export, because the file has to match what the cutter expects. Once you have checked the format, save the file and send that same file to the cutter.

Is VectorMagik free for model railroad builders?

VectorMagik is free for everyone, and business use needs a licence [1]. It is licensed under PolyForm Noncommercial 1.0.0 [1]. If you plan to use the tool for paid work or a business, read that licence first, because its terms apply to that kind of use.

Can VectorMagik run in a browser or from the command line?

A version runs in the web browser using the same engine [1]. A command-line version does the same work without a window, and it lets an AI assistant trace pictures on your computer [1]. Choose the version that suits how you prefer to work, since both use the same engine for the tracing.

What should you check before you choose a laser cutting file tool?

Check which file formats the tool saves in, whether it traces a picture or only edits drawings, and what it charges on its own pages. Check whether it runs on your computer or in a browser, and whether its licence allows the use you have in mind. This page does not state those facts for other tools, so read each tool's own pages before you decide. Then try a small test cut with the file it produces.

Free for everyone; business use needs a licence (PolyForm Noncommercial 1.0.0). [1]

Try VectorMagik

Sources

  1. VectorMagik's own description of itself (the product of this site's publisher)

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