M3 Key 3D Printed Workshop Tool

Design preview. Rendered from the file, not a photo.

The maker says it fits: M3 nuts (5.5mm). See the proof

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What it does

Holds M3 nuts steady so you can lock them in place without slipping
Sized for light work and precision tasks, not heavy force applications
Print on demand and have your own custom workshop tool within days
Small and handy design fits in your palm for easy one-handed use

You get a simple, smart way to hold M3 nuts still while you work. This small key fits snug around 5.5mm nuts, so you can lock them down without wrestling with pliers or wrenches.

The M3 Key handles light holding tasks perfectly. It is not built for heavy force, but for precision work and keeping nuts from spinning, it works great. The compact size means you can grip it easily and work in tight spaces where bigger tools do not fit.

Order now and print your own. You will have a custom workshop tool ready to use whenever you need it.

1.4k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: M3 nuts (5.5mm)

That is the maker's word, not a fit we measured. Check the size below against your own.

M3 nuts (5.5mm) (model M3)From the maker's own listing notes, checked 2026-08-13. See the original post

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.

Who made this design

Shared under GNU GPL. See the original design