A simple and stable holder with 3 countersunk holes for sourface mounting with screws. Designed in 2 parts for printing reasons (no need for support). The retaining plate fits in with tongue and groove with the holder and is also screwed. There ist a holder with 6 cm width which fits XYZ-ware spools and an other with 10 cm width fits many others. Btw it is a good idea to store the filament in a zip-bag after use to protect it from humidity. A filament guide as lid assembly with scraper will complete the set in future ... to be continued ...In a layer thickness of 0.2 mm each printed in ABS with 5 upper and lower layers, and 3 perimeters . A degree of 25% concentric filling granted sufficient stability even under heavy coils.