cart axle and wheel hubs
thingiverse
A tiny upgrade is also necessary: adding axles and wheels to the list. Axles themselves are quite lengthy, so it's possible to trim them down if needed.
Download Model from thingiverse
With this file you will be able to print cart axle and wheel hubs with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on cart axle and wheel hubs.