This is a top mounted filament spool holder for a Delta printer with 2020 extrusions.
Print 2 of the horizontal brackets and 2 of the vertical brackets.
Assembly and use
Attach the two horizontal brackets together using M4 x 20 hex head machine screws and M4 nylock nuts.
Attach the horizontal assembly to the top of the 2020 extrusions using M4 x 18 machine screws and M4 t-lock nuts.
Attach each vertical bracket to the horizontal assembly using an M4 x 20 hex head machine screw, an M4 flat washer and an M4 wing nut.
I used 1" plastic conduit as the shaft.
The vertical brackets are easily adjusted for any width spool by loosening the wing nuts.
There is plenty of room above a delta printer to mount the filament spool and it allows the filament to be fed into the extruder from above. The brackets are adjustable for spools of different widths.