Free Multicolor No account needed

Genstrio

Free, open-source hub of 12 parametric generators for enclosures, gears, Gridfinity and more, as STL, 3MF or STEP

Genstrio is a free browser tool for exact workshop parts, enclosures and gears without CAD. Free and open source, no account. Exports STL, 3MF and STEP. Last checked 10 October 2026.

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At a glance

Price: Free and open source, no account
Runs on: Browser
Exports: STL, 3MF, STEP
Multicolor: Yes
Account: Not needed
Open source: Yes
Skill level: Easy: a few settings to tune
Best for: Exact workshop parts, enclosures and gears without CAD
Selling prints: Allowed The README says the models you generate are yours, without restriction; the AGPL-3.0 license covers the code. The bundled fonts are under the SIL Open Font License, which allows commercial use in what you make.
How we checked: Made and downloaded a file Opened the text and signs generator, which built a sign in about 2 seconds, and downloaded it as 3MF and STEP without an account; README read
Last checked: 10 October 2026

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Sources: Genstrio, Genstrio on GitHub (README and license) (checked 10 October 2026)

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What is Genstrio?

Genstrio is a free, open-source set of 12 parametric generators that runs in the browser on a real CAD kernel. You enter dimensions, watch the model build in 3D, and download it. Nothing is uploaded and there is no account.

The generators make electronics enclosures (with templates for Raspberry Pi, Arduino, ESP32 and other boards, connector cutouts, screw or snap lids, vents and DIN rail clips), pipe and hose adapters (reducers, elbows, T and Y pieces, garden hose and pipe thread sizes), drawer organizers, Gridfinity bins, holders and baseplates cut to fit a drawer, hooks, pipe clips and shelf brackets, text signs, tags, stamps and stencils, gears (spur, helical, herringbone, planetary sets, bevel, worm drives, racks and GT2 pulleys), QR code plates, logo reliefs from an SVG or image, cookie cutters with an optional embossing stamp, lithophanes (flat, curved, lamp shade or sphere, with a base for a battery light), and print-in-place hinges and sliding bolts.

Downloads are STL, 3MF with each part as a separate object for a second color, or STEP with the exact geometry for further editing in FreeCAD or Fusion (lithophanes are STL or 3MF only). Settings include millimeters or inches, your bed size and a fit allowance, and you can save templates, export a project file or copy a link with all values.

The code is AGPL-3.0, and the README says the models you generate are yours without restriction. It has many options per tool, so it suits makers who want practical, exact parts rather than quick gifts.