Free

Screw Generator by Koolm

Metric and inch screws, nuts and washers with real thread specs, made on MakerWorld

Screw Generator by Koolm is a free browser tool on MakerWorld for replacement and custom fasteners. Free; MakerWorld login needed. Exports STL and 3MF. Last checked 25 September 2026.

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At a glance

Price: Free; MakerWorld login needed
Runs on: MakerWorld
Exports: STL, 3MF
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Easy: a few settings to tune
Best for: Replacement and custom fasteners
Selling prints: On a paid plan CC BY-NC-SA license, so no selling prints without permission; Koolm's paid membership adds the right to sell physical prints of every Koolm model.
How we checked: Read the tool page and docs Model page: M2 to M24 and #4 to 7/8 inch sizes; v2.0 adds extra-fine threads; CC BY-NC-SA license; about 154,000 customizations
Checked by: Mike Janssen
Last checked: 25 September 2026

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Sources: MakerWorld model page (description and licence), Koolm membership note (Stamp Maker page) (checked 25 September 2026)

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What is Screw Generator by Koolm?

Koolm's Screw Generator is the most liked fastener tool on MakerWorld, with over 150,000 customizations, and it was featured on Hackaday in early 2025. It is an OpenSCAD script built on the BOSL2 library, wrapped in MakerWorld's form-based customizer so you never see the code.

Pick a screw, nut or washer, then choose the size: metric M2 to M24 or UTS inch sizes from #4 to 7/8 inch. Screws can have hex, pan, flat, socket and other heads, with Phillips, Torx, slot and other drives, and you set the length and thread options. The geometry follows ISO, DIN and UTS dimensions, so a printed nut can fit a real bolt and the other way round, within the limits of your printer.

It is free with a MakerWorld account and downloads as STL or 3MF. It suits repairs, prototypes and anyone who needs an odd fastener tonight rather than next week. Printed threads are no match for steel, so keep loads light.