Wednesday, November 16, 2011

Extruder drive-screw

It seems there is only one way to mount the dremeled transport screw. That is with the nut in the gear. The gear it self imparts a slight twist to the filament, if the head of the screw is in the gear it's counter-clockwise. If the nut is in the large gear it is clockwise. This may seem trivial, but I found with changing the spin direction I got a more consistent extrusion flow. With counter-clockwise spin it was really inconsistent. I have to assume this is because the hole the filament goes down is slightly fluted from using a drill bit to clean the print... or from the drilling of the PEEK barrier. This still needs more testing though, I have another duplicate extruder almost setup. Maybe I can replicate the results with the other extruder.