UP Mini extruder gear cooling mod

[Jeeplvr]

I waited to post this one. I have been printing almost non stop for 24 hrs. and not one jam. I removed the small brass filament guide tube from the heating element and opened up the entrance with a small centering drill. If you don't know what a centering drill is, it is a tapered drill bit for use on a lathe to drill a tapered hole in the end of a shaft for the lathe centering support mechanism. The entrance of the brass guide is the point where the filament jams every time on my machine. With the centering drill I basically increased the chamfer diameter and depth of the original chamfer. The combination of the plastic mods and increased chamfer has , for now, solved the problem of filament jamming.