Lego Technic compatible gears with custom sizes

Lego Technic compatible gears/cogs with custom numbers of teeth.
746
5342
26
21 k
updated March 29, 2026

Makes

Comments

Your 3D-printed gears look excellent! Clean, precise, and well-defined, with no visible printing errors. The fact that the axle hole works is a major success, as this is critical for functionality.
Strengths: Symmetry, tooth shape, and overall structure are spot-on.
Improvement: The axle hole could be 0.1–0.2 mm tighter for a snug fit…

Image preview

tight fit

Image preview

a bit of a tight fit

Image preview

Printed 3 56_gears on my creality ender 3 pro!
3 walls/top/bottom layers.
0.16mm layer height
This makes the model fit snugly on the rod. Great model, used the gears with a 8tooth gear for a fast gear ratio. 8:56

Image preview
Image preview

Works good, though a bit loose on the axle and the holes in the gears were too big for a pin. I used them on an RC car to get the perfect balance between speed and torque.

Image preview

@marian42_58592 Would you make a series like this for thin V-belts and rubber rings? (pulley)
Thanks!

printed well and works needs tolerances of about -0.1 - -0.2

Image preview

when i 3d print these gears it seems to be very stringy at the bottom what do I do?

Can you make a 64 tooth gear?

Could you make a Double Helix/Herringbone version of these gears please?

I'm dissapointed. I put it on my around 6:1 gear ratio (or more) and didn't spin unlike if I used the Lego 8 gear, and if it did spin it would fall off! I kind of fixed it by adding a peg at the end, and it spins, with a lot more resistance than the 8 gear. well I did print the 9 gear. (edited)

Image preview
Image preview
Image preview