Designed to carry ISO filament spools with 300 to 350mm diamenter and a width of 102mm.
(additional sizes added, see updates below)

Required Bearings:

• 4x Ball Bearings (inner diameter 8mm, outer diameter 22mm) (https://www.amazon.de/gp/product/B00EPNN62M)
• 4x Ball Bearings (inner diameter 12mm, outer diameter 32mm) (https://www.amazon.de/gp/product/B08V4T9WQZ)

The bearing sockets are a tight fit. If you don't get the bearings on, simply use a screw clamp to push them in place.

Additional sizes can be added by request, just leave a message or a comment....