Universal Filament Spool Holder - Idler Pulley

Here is a universal fit filament spool holder I designed to go on top of my dresser next to my Tronxy X1 printer. I had previously used a spool holder similar to this design that used bearings pressed fit between two 3D printed pieces but after just a few completed prints the two halves separated and the filament spool fell over. This design uses a total of 4 - M3x20mm bolts / nuts to hold 4 - 3mm idler pulleys in place and the lip of the idler pulley helps prevent the spool from sliding off or