Reuleaux Polygon Wheels & Coins - 3D Printed Toy Set
Design preview. Rendered from the file, not a photo.
This model is not currently offered as a verified ready to buy print.
What it does
- Build rolling non-circular wheels that actually work using geometry magic
- Print replica British 20p and 50p coins with constant-width shapes
- Learn why sewer covers don't fall through their holes, it's math!
- Perfect educational toy for geometry enthusiasts and curious tinkerers
- Includes multiple Reuleaux polygon designs ready to print and explore
Ever wonder why sewer covers are round? Turns out circles aren't the only shape that won't fall through their own hole. Meet the Reuleaux polygon, a family of constant-width curves that roll, work as coins, and make brilliant 3D printed toys for anyone curious about geometry in action.
This design file lets you print working non-circular wheels that actually roll smoothly, create your own versions of British 20 and 50 pence coins, and explore the same math used in real-world engineering. Reuleaux polygons are used in everything from currency (like the Mauritian 10 rupee and Jordanian dinars) to manhole covers that can never fall through their openings.
Perfect for makers, educators, or anyone who loves a good geometry puzzle, these pieces snap together to demonstrate constant-width curves in a hands-on way. Roll the wheels, stack the coins, and impress your friends with the smarty-pants answer to that classic engineering riddle.
1.6k downloads in the maker community. That is interest in the design on the site it came from, not our sales.
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 We have not load tested this design, so we do not publish a weight rating.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.
More like this
Flexi Rex. Articulated T-rex, prints in one piece.
Design library
Flexi Cat. Articulated cat, prints in one piece.
Design library
Articulated Slug. Wiggles like the real thing.
Design library
Wip Tiny Articulated Robot - 3D Printable Ball Jointed Doll
Design library
Articulated Slug. Print-in-place desk toy.
Design library
Player Character Pack 03 - D&D Miniatures
Design library
Zheng3 Penny Ballista for Seej Tabletop Wargame
Design library
Flexi Raptor Toy with Stronger Tail, Multi-Joint Velociraptor
Design library
Who made this design
Designed by dnewman. We did not draw it.
Shared under GNU LGPL. See the original design