I wanted a filament spool storage system I could mount on the wall that could be printed on my A1 mini and I couldn't find anything that suited what I wanted so I designed this. Printed in petg at .28 layer height 4 walls 15% infill it seems plenty strong and I used .5 inch metal conduit to go between them. I wanted 5ft long shelves but with the weight of the filament it really needs to be screwed into a stud so you can slide the bracket wherever you want on the conduit to line up with a stud.