MK3S+ with MMU2S Only printing giant blob in home position, never starts print
Hello!
I have been using my MK3S+ with MMU2S for about 3 months now with not very many issues (some minor things I was able to overcome with support articles and this forum).
A few days ago my printer started having an issue. Previous to the issue when the printer would start a print it would go to the home position of the build plate (nozzle all the way in the front corner) and would lay down a small blob of filament, then proceed to do a line across and then one back, then the print would start.
However now it goes to start the print and simply sits in the initial position and continues to lay filament until I stop it or it errors on the MMU2S. I have included a couple of photos and short video clip.
I just tried running the first layer setup again and it had the same problem. Any help or suggestions would be welcome.
Best Answer by nateshaw:
I solved it!! It was the IR / Filament sensor in the chimney. I just re-calibrated it using this https://help.prusa3d.com/en/article/ir-filament-sensor-calibration-mmu2s_2245
Now all appears to be working. More tests to make sure
RE: MK3S+ with MMU2S Only printing giant blob in home position, never starts print
Did you try a gcode that has been printed fine before this problem started?
Maybe something is wrong in the "start gcode" in PrisaSlicer.
RE: MK3S+ with MMU2S Only printing giant blob in home position, never starts print
Yes, I tried gcodes that had worked previously. I tried re-slicing to create new ones. I tried the default ones that came with the printer. I even ran the first layer setup on the printer and it did the same thing
RE: MK3S+ with MMU2S Only printing giant blob in home position, never starts print
I solved it!! It was the IR / Filament sensor in the chimney. I just re-calibrated it using this https://help.prusa3d.com/en/article/ir-filament-sensor-calibration-mmu2s_2245
Now all appears to be working. More tests to make sure