This is a simple clip on spool holder for Joel's little competition. The holder hooks over the wooden slate and has a small 3mm nub to the bottom just to hold it in place. Can be quickly relocated anywhere on the slates at only 35mm wide. Idea would be to print on the side so no support structure is required and layer lines should give adiquate strength to the part. I have a similar tabletop version with an arm this size and i haven't yet found one Kg spool it won't hold.