Prusa i3 filament spool holder

This is a design for a spool/filament holder for the prusa i3 printer. The First file includes the posts for the holder that clip onto the frame without the use of any hardware. The second file includes a low resistance spool center drum. The diameter of the first drum file is 2.35 inches, and the diameter of the second is 2.25 inches (varies depending on the filament role) The idea of the drum is to reduce pull/tension to the extruder.
* will fit two spools
Hardware you will need:
1- M8 Thr