Here's a video explaining the spool holder... https://www.youtube.com/watch?v=fcPFLtofpFk&feature=youtu.be This is my solution to fix common problems related to Taulman brand Spools... This design is based roughly on a popular Spool holder design I made a few years ago... http://www.thingiverse.com/thing:290064 ... Taulman makes great filament, but their spools are packed to the brim, very tight, with no place the keep the end of the filament controlled... This causes a lot of the spool to completely unwind everywhere... You can either cut it off and waste the filament, or try to wrap it back up and risk getting a snag or your spool locking up later while printing.... My spool holder has a place to keep the end of the filament held... And lockers which lock the spool in place - restricting it from spinning when you don't want it to spin... The dimensions of the spool holder are near perfect, so everything will fit and screw in well - even on low resolution... Thanks for viewing my spool holder - be sure to like it... I hope you find it useful!!!