Both wheels of my Xiaomi G20 Vacuum roller brush broke at the axle, and there was no way to glue them back. So I designed a wheel clamp to fix the wheels back! 

Materials: 

 - Printed parts 

 - 2x 608 bearings

 - Original wheels, screws, and axle sleeve

Instruction: 

1. Print out the parts. (I used Elegoo PLA which is strong enough)
2. insert 2x bearings in the inner part of the C-clamp. they should be press fit.
3. insert the new printed axle from the inner part of the C-clamp, through the bearings. these should be tight to ensure the wheels do not wobble. if they are too big, sand them slightly.
4. Insert the printed axle sleeve from the outer part of the C-clamp
5. Insert original wheel
6. Screw using original screw into the printed axle. Make sure it's not too tight such that the wheels can still spin freely.