This is a Spool Holder designed for the 3D Printing Nerd Design Challenge.
There are two different types of this holder available: normal and long.
The normal holder (Holder Left and Holder Right) are designed for 1kg spools or smaller. It can acommodate spools with a maximum radius of 100 mm and a width of 95 mm.
The long holder (Holder left Long and Holder Right Long) are designed for larger spools, up to 5kg or so. It can acommodate spools with a maximum radius of 160 mm and a width of 165 mm. Note that this holder has not been tested with 5kg spools as I don't own any.