I am finally getting around to posting this. We bought our UM3E about 12 months ago. The first time I ran a print over night, the filament jumped over the edge of the spool, got bound up around the spool post, and caused the print to fail (in the last 60 minutes of the 20 hour print job). I was very frustrated.
So I designed a simple add-on to prevent this from happening again. The factory equipment restrains the filament at one point around the spool, leaving it free to jump th