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OOZE at startup time
Posted: Wed May 13, 2015 4:49 am
by xr750
While waiting for the heated bed to rise to print temperature. The filament would ooze from the hot end and make a mess on the heated bed. So, I changed the start up GCODE to wait until the bed was up to temperature prior to turn on the hot end. Solved the problem.
Re: OOZE at startup time
Posted: Fri May 15, 2015 1:47 pm
by Eaglezsoar
xr750 wrote:While waiting for the heated bed to rise to print temperature. The filament would ooze from the hot end and make a mess on the heated bed. So, I changed the start up GCODE to wait until the bed was up to temperature prior to turn on the hot end. Solved the problem.
Great idea! Thanks for sharing your tip.
Re: OOZE at startup time
Posted: Fri May 15, 2015 3:40 pm
by bot
A lot of slicers do this automatically. Another thing that can be done, is that a short print move can be completed at an extremity, to clear the nozzle of debris before beginning the purge/skirt, then the print.
Re: OOZE at startup time
Posted: Wed May 20, 2015 11:34 am
by Creator
Nice! Noob question:
Since my printer only is about a week old i have no idea how to actually "change the start up GCODE"..
Is there any good posts/guides on GCODE that you could recommend?
Re: OOZE at startup time
Posted: Wed May 20, 2015 12:26 pm
by ccavanaugh
Another approach is to add g-code to take the nozzle to the surface of the bed after it heats, then turn the nozzle on. After nozzle reaches temp, lift a millimeter or two and print.
This stops all drool even while the nozzle heat because it's blocked off.
It also reduces 1st layer nozzle temp drift because the PID control has already adjusted to the effect of it being close to the heated bed.
Re: OOZE at startup time
Posted: Wed May 20, 2015 3:45 pm
by RAMTechRob
Can you give us this new Gcode?
Re: OOZE at startup time
Posted: Wed May 20, 2015 5:38 pm
by ccavanaugh
Code: Select all
M190 S<BED> ; set the bed temperature
G4 S60 ; wait for bed to settle a bit and spread
M104 S<TEMP> ; set the extruder temperature and return
M44 ; Turn on the chassis fan
G28 ; home all axes
G0 Z20.0 X0 Y90 F3800 ; move and place the tip on the bed
G0 Z0.00 X0 Y90 F1500 ; to prevent drool and hotend heats
M109 S<TEMP>; set the extruder temperature and wait
G4 S5 ; Dwell, make the blob stick
G0 Z1.00 X0 Y90 F2500 ; Lift the tip to prevent dragging
This is what I use of Kisslicer
Code: Select all
M190 S[first_layer_bed_temperature] ; set the bed temperature
G4 S60 ; wait for bed to settle a bit and spread
M104 S[first_layer_temperature] ; set the extruder temperature and return immediately
M44 ; Turn on the chassis fan
G28 ; home all axes
G0 Z20.0 X0 Y90 F3800 ; move and place the tip on the bed
G0 Z0.00 X0 Y90 F1500 ; to prevent drool and hotend heats
M109 S[first_layer_temperature] ; set the extruder temperature and wait
G4 S5 ; Dwell, make the blob stick
G0 Z1.00 X0 Y90 F2500 ; Lift the tip to prevent dragging
This is what I use of Slic3r
Re: OOZE at startup time
Posted: Wed May 20, 2015 5:42 pm
by RAMTechRob
Thanks, I will give that a try.