Re: automatically clean ooze drool from nozzle before printing
Does 20mm retraction increase the chances of clogs?
Re: automatically clean ooze drool from nozzle before printing
Does 20mm retraction increase the chances of clogs?
Hasn't happened.
Re: automatically clean ooze drool from nozzle before printing
Noob question... why does this look so different from the Prusa Default in Slic3r?
My Simply3D code (which is a hack of code posted by shockofmight on the Simply3D forum) is:
Starting Script:
M500 ; create config-override
G1 Z50 ; raise PINDA so that it's not effected by the heating of the heat bed
M140 S[bed0_temperature] ; bed temp
M190 S[bed0_temperature] ; wait for bed temp
G80 ; run mesh bed leveling routine
G1 Z50 ; raise PINDA so that it's not effected by the heating of the heat bed
M106 S[fan_speed_pwm] ; fan speed
M104 S[extruder0_temperature] T0 ; nozzle temp
M109 S[extruder0_temperature] T0 ; wait for nozzle temp
G28 W ; home all axes without mesh bed leveling
G1 Y-3.0 F1000.0 ; prepare to prime
G92 E0 ; reset extrusion distance
G1 X60.0 E20.0 F1000.0 ; priming
G1 X200.0 E40.5 F1000.0 ; priming
G92 E0
G1 E-1.0000 F2400
G1 Z0.600 F1000
Ending Script:
G92 E0 ; prepare to retracgt
G1 E-10 F1800 ; retract 10mm
G4 ; wait
M106 S0 ; turn off cooling fan
M104 S0 ; turn off extruder
M140 S0 ; turn off bed
G1 X0 Y200 Z50; part removal
M84 ; disable motors
It does not presently account for measured PINDA temperature, so there's room for improvement. Nonetheless, I've finally reached the nirvana of "fire and forget" for starting a print job. I don't need to be there, hovering over the Prusa I3 MK3, to ensure a good start anymore. Instead, I've been able to start it from a different part of the house and just come back when it's finished. That may eventually bite me, but so far it hasn't.
FWIW, I'd prefer to go to a z-height of z202 instead of z50, but I've found that if I do, then with some filaments, the filament comes off the coil, at least with using the Prusa filament holder. Maybe there exists a spool holder where that won't happen?
Re: automatically clean ooze drool from nozzle before printing
So the process that I am using is: before a print, check the PINDA temp in the Support menu, to ensure it's below 35C. Then start the print.
Very clever! The only problem I see with that is that if I have an aborted print (say, the first layer was fubar and I opt to start over), or if I'm doing consecutive prints, it might be a very long wait for the PINDA temp to drop below 35C so that I can start the printing process again. Do you use external high speed fans to accelerate the cooling? Or, are you just more patient than I am? 😉
There is a firmware change coming that will allow you to use g-code to wait for the PINDA to cool. So you'll just be able to create a single start-up script that handles cool down or heat up until PINDA is at the right temp. It doesn't solve the issue of the delay, but at least you can just start the print and go.
The alternative is to manually calibrate the PINDA temperature compensation table. That would allow you to start a print with just the single check that the PINDA is above some minimum value.
RE: automatically clean ooze drool from nozzle before printing
OK so this is an old thread but I do want to try and resolve the same issue. Have you good folk resolved this now? Does someone have a code with all the code alterations included like the setting hot end to 170 at first and retraction at end?
I've never touched G-Code before so am a little nervous about changing it.
RE: automatically clean ooze drool from nozzle before printing
Did you ever get any answers? I'm thinking I should do this as well as some filaments just like to drool.