I have been experiencing an issue with the second layer of a print. I have a failure rate of 75% where the first layer apparently is created correctly but the second layer fails to extrude anything. This always happens when the layer height is set to less than 0.3mm or I am attempting to print with PLA. PLA has a 0% success rate.
I have tried increasing the extruder temperature and slowing down the print, but so far, nothing. I figure that the problem is that the pressure on the extruder is too high, but I do not know what to do about it.
I have performed a few tests with extrusion and retraction using the buttons on PrintRun. I set the length to 15mm and attempted extrusion, but only ~7mm fed. I retracted, and 15mm retracted, then I extruded, and 15mm extruded (well, fed into the extruder). I then attempted to extrude again and only got ~7mm. This is fairly consistent. I was able to get PLA to extrude 15mm consistently by setting the temp (for PLA) to 220 and the extrusion rate to 50mm/s. For ABS, the temp is 240 and the extrusion rate is 50mm/s as well.
I have attempted to SLOW the prints down, but it only works for “draft” (i.e., 0.30mm+ layer heights) prints using ABS. Everything else results in print failure.
Any ideas or suggestions?