Filament threads after print starts?
Hi there,
i'm a 3D-printing beginner and just started this weekend with a Prusa i3 MK2-KIT.
I'm really happy with it and got it calibrated without big problems. Printquality is really good and i've never seen a build-manual like this; thumbs up! 🙂
I use Slic3r with customized prusa-presets and octoprint. PLA from Prusa, printed at 210°.
Now i'm having some problems with the start of a printjob. The first layer is okay (first layer is printed at 68°, with lower temp the adhesion is to bad so it's oozing; also i lowered the firstlayer-speed to 40%), but in the most cases, the hotend heats up and to the point, where the printer starts to auto-calibrate, the filament flows some cm out of the noozle. I remove that, but in the time the printer calibrates, there's forming a filament ball/wad around the nozzle.
The printer starts to print the skirt, and i have to be carefully, that this filament ball/wad and fine oozing-lines doesn't interference my print.
Is there, maybe in Slic3r, any option to retract the filament a little bit before the print starts? The suspect ... sometimes, there's no filament flew out of the noozle before the print starts. Don't know the reason... maybe you have some tips?
Re: Filament threads after print starts?
Modify starting gcode script in Slic3r to heat up only to 170C before calibration and only then heat up to target temperature. Temperature of 170C ensures that any remaining filament on the nozzle will get soft enough to not collide with bed during calibration, but not soft enough to ooze. Something like this:
M83 ; extruder relative mode
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S170; wait for extruder temp
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Y-3.0 F1000.0 ; go outside pritn area
G1 X100.0 E15.0 F1000.0 ; intro line
Re: Filament threads after print starts?
Thanks, works great 🙂 Had to switch 2 lines:
M83 ; extruder relative mode
M104 S170; wait for extruder temp ; FIX 170 grad
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S170; wait for extruder temp ; FIX 170 grad
G28 W ; home all without mesh bed level
G80 ; mesh bed leveling
M104 S[first_layer_temperature] ; set extruder temp
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Y-3.0 F1000.0 ; go outside pritn area
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line