Nerf Bearing Motor Spacer
thingiverse
Motor spacer for Nerf motors that use a ball bearing. 1.5mm thick and approximately the size of a motor profile. Print 2 and put one in each side of the cage. Works great if you have alignment issues with high concave wheels sitting too high, but otherwise if you see no issues they aren't necessary. I admittedly haven't printed these and tested yet since I'm out of town, but will do ASAP.
Download Model from thingiverse
With this file you will be able to print Nerf Bearing Motor Spacer 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 Nerf Bearing Motor Spacer.