This spool holder is designed to work with the original spool holder which comes with the makerbot or extra printable once which are included in the files. The wall mounts should be mounted with the spacing of a 'Tag' in between (100mm). The tags can be printed with the filament that it's supposed to hold so that it can show you which roll of filament goes where. This makes that you also have a sample of every color when printed. Specs of the prints: Wall mount: Holder: Tag: Specs of the prints: Wall mount: Holder: Tag: