This is a filament spool holder to go on the tops of 20mm extrusion.

Based on Thingiverse thing #4212228 which doubles as a handle.

Unfortunately, most printers are too heavy to pick up the printer by this spool holder that goes on 20mm extrusion. Seriously, I do not recommend it. Grab the printer by the top rail.

I repeat.

NOT A HANDLE

I recommend putting the smoothest side of the thin piece up. That will allow the spool to move more freely.