A simple Bracket to add dowels or broomsticks to Multiboard. The bracket is ready and requires three large bolts - two to attach it to the Multiboard and one to attach the top and bottom sections to each other. The goal of having separate sections is that you can position this wherever you like and add the broomsticks at the end - much simpler than trying to install while already inserted.
Warning - Multiboard cannot handle the forces of a large dowel with 12-16kg of filaments. It will flex and deform, even if you use three brackets to distribute teh weight. At a very minimum, add offset pegs under this bracket. Ideally, use this custom bolt i designed that will allow you to rest the bolt against the wall and also to screw the bolt down against the wall, transferring the weight of your filaments to the wall and not the Multiboard tile.