I just finished my Mendel I2 with .5mm nozzle for 1.75mm filament. I printed my calibration cube with perfect success and another practical print in PLA. I then tried ABS and it was a terrible failure, with general inability to extrude the filament and the bed can barely get to 110c target temperature.
So I went back to PLA and tried to eject the ABS with a followup of the PLA fiber at ABS temps until it ran fairly clean. Since then, clogging has been fairly consistent with only short periods of it extruding effectively.
I will disassemble the hot end tonight and see what I will see. My suspicion has been that the very roughed up filament abraided some of the PTFE liner which is then clogging the extruder but I have read of a number of other possible scenarios. Inspection will tell and I will share the results here for the benefit of others.
Gallery of photos of successful and failed prints (due to poor extrusion ) [www.dropbox.com]
So I went back to PLA and tried to eject the ABS with a followup of the PLA fiber at ABS temps until it ran fairly clean. Since then, clogging has been fairly consistent with only short periods of it extruding effectively.
I will disassemble the hot end tonight and see what I will see. My suspicion has been that the very roughed up filament abraided some of the PTFE liner which is then clogging the extruder but I have read of a number of other possible scenarios. Inspection will tell and I will share the results here for the benefit of others.
Gallery of photos of successful and failed prints (due to poor extrusion ) [www.dropbox.com]