This upgrades the original Bambu Lab metal spool holder to incorporate a bearing based spool for better filament feeds. All you need to do is to flip the metal one upside down and insert the bearing holders, attach the bearings to the spool and seat the spool into the holders. It is compact and easily upgrades the original holder for those pesky cardboard spools. 

You will need:

• the original metal Bambu lab spool holder (turned upside down)
• 2x 608 bearings

Have fun printing!