We've got a BFB 3D Touch and we've found that the 3mm PLA snaps in the feed tube almost every night. Getting the broken filament out is a real pain in the neck. To circumvent this we've taken to mounting the spool off the side of the machine. The arms are designed to fit a 1/2" dowel or other rod as that is what we had at the time.Printed on a Replicator 2 with the outside end down with raft and support. The .stl files are scaled in inches.