Now updated to V2. (changelog below) The Spool Holder can hold spools with an inside diameter from 39mm up to 70mm and a maximum width between 95mm and 125mm (depending on the inside diameter). Technical information: The tread used to clamp the spool is a multi pitch thread (multiple starts, like a jar of jam) so the travel per revolution is 3 times as much. This makes putting on the nut easier and you don't have to make as much revolutions to clamp the spool. Changelog Update V2: I made the tolerances bigger so there should be no more problems with parts that don't fit. I also improved the strength of the Threaded Cone V2 so it wont brake when you tighten the treads hard. This resulted in an increase of the minimum inside spool-diameter that can fit (was 33 now is 39). In the "Files V1 (old model).zip" you can find the files before the update. I also uploaded the .gcode files I used to print the V2 model. I know these files work on Ultimaker's 2 and 2+ (Maybe on the Ulitmaker 3 as well) I used the Low friction spool holder by IRobertI as inspiration. The Solidworks and step files are also available. https://youtu.be/ye2tGyrJXD0 (this video is taken from the old V1 model, the new one works just as well)