cmaloney wrote:elmoret wrote:What makes you think it is coming out too fast? How many inches per minute?
Nozzles are intentionally supplied a bit undersize. It is easier to make a smaller hole bigger (depending on the polymer) than to make a bigger hole smaller.
Not sure about inches/minute. I couldn't it get extruded without turning into a big mess. Before I moved the fan mount so the guide is basically bypassed, it would drop immediately out of the nozzle and curl up into a big blob before it even made it to the guide. Decreasing temp allowed it to make it a little further but once it hit the guide it would stick and do the same thing. I never tried keeping high temperature (and thus speed) after bypassing the guide, but wouldn't the higher temps increase the stretching effect and decrease diameter further? I could try drilling it to 2mm, but my drop is about 3 feet before the Filawinder takes it. At 145 it is still very stretchy when it makes it to the Filawinder.
BTW, did I miss the instructions on how to calibrate the PID? I set mine to 145 and it maintains that temp when not extruding, but it jumps from 130 to 155 when extruding.
PID autotuning instructions are on page 9. They should be done while extruding. If you move or change the fan position or speed, autotuning needs to be done again.
145C sounds really low to be getting much output at all. I'd expect only a few inches per minute at that speed. If you're seeing more, it sounds like a setting in your PID controller is incorrect, like it might be set to the wrong type of thermocouple and therefore reading the temperature incorrectly. Please compare your controller's settings against the factory defaults, as described on page 9 of the instruction PDF.
Did you do the purge with the included ABS? If so, how did you handle the changeover to PLA?