Precision Bearing Catapult | No Support

A desktop catapult with real bearings and steel springs for reliable performance.

This catapult uses 5mm bearings and steel compression springs instead of printed parts for smooth, consistent action. The trigger mechanism uses a return spring, and the main power comes from up to five compression springs that can be adjusted for different throwing distances. Real dowel pins and bearings ensure more accurate and precise launches.

Why This Design Is Awesome:

Real Bearings - 5mm precision bearings for smooth rotation and long life
Steel Springs - Adjustable power with 1-5 compression springs
Dowel Pin Assembly - Press-fit pins hold everything together securely
No Supports Required - Clean, easy printing with no cleanup
Trigger Return Spring - Automatic reset after each launch
Works with V3 Arbor Press - Makes bearing installation easy and precise (link below)

Hardware Needed:

• 6× 5mm ID x 10mm OD x 4mm thick bearings
• 4× 5mm × 35mm dowel pins
• 5× 8mm OD x 40mm L x 0.6 wire diameter compression springs (main power)
• 1× 7mm OD x 12mm L x 0.5 wire diameter spring (trigger return)

Bill of Materials available through:

• MakerWorld Maker Supply (one-click ordering)

Complete Build Guide

Design walkthrough, print bed setup, and assembly instructions with bearing press technique: https://youtu.be/TKfoD_alMHE

Arbor Press v3: https://makerworld.com/en/models/2199325-improved-3d-printed-arbor-press-v3-no-support?from=search#profileId-2389112

Help Us Keep Making Cool Stuff

If you like this design, subscribe to our YouTube channel at https://www.youtube.com/@MacshayCreations. Your support keeps us cranking out free STL files for the community. More subscribers = more builds, more designs, more free downloads.

We'd love to see your build! Post a photo of your finished precision bearing catapult in the makes section so we can check out your print!

For STL licensing options, check out our Patreon: https://patreon.com/MacshayCreations