This bracket is designed to hold 1kg and 500kg rolls.
The hole diameters are 16mm and I was able to get them to accept 1/4" copper pipes I had laying around.
Feel to print as many as you want however do know you will need to print at least two
the holes are pass through so potentially you could print as many as you need to hold up however many rolls of filament you need.
Spool_Holder_Bracket.stl | 124.5KB |