filament spool holder

spool holder for up to 4 spools..
mine is attached to a aluminum profile i used to reinforce my (acrylic) frame, but this should also work for all frames using a 2020 profile

BOM:
Part1: spool holder
Part2: 2x spool holder clamp (endcap)

1x 10mm aluminum Pipe 300 mm long (or as needed)
1x M3 25mm screw und nut (for the pipe clamping mechanism)
4x M4 ?mm screws and nuts (for mounting the holder)

2x M3 12mm screws for the endcamp (these are designed for an inner diameter of 7.7mm)