[Solved] Extruder calibration?  

RE: Extruder calibration?

Common problem, many of us do all the calibration steps before heating the nozzle to print temperatures.  Here's how I do it in my Printer Settings Custom Gcode.  
(ps: I am using a special version, so my G80 command is non-standard, but should work with stock firmware)

M115 U3.4.0 ; tell printer latest fw version
M83 ; extruder relative mode
G28 W ; home all without mesh bed level (cold zero to get PINDA low)
M104 S185 ; set extruder partial temp 
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S185 ; wait for extruder temp
M860 S35 ; wait for PINDA temp to stabilize
; G4 P15000 ; wait another 15 seconds to warm PINDA
G28 W ; home all without mesh bed level (hot)
G80 N7 ; mesh bed leveling N7 = 7x7 ?
G91 ; move relative
G1 Z10
M109 S[first_layer_temperature] ; wait for extruder temp
G1 Z-10
G90
G1 Y-3.0 F1000.0 ; go outside print area
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line pt 1
G1 X100.0 E12.5 F1000.0 ; intro line pt 2
G92 E0.0
M221 S{if layer_height==0.05}100{else}95{endif}

RE: Extruder calibration?

thanks to you!

With your help, I solved my problem and took my first steps in G-Code! Here is the procedure that I adapted with my default firmware with your code:

M115 U3.6.0 ; tell printer latest fw version
G90 ; use absolute coordinates
M83 ; extruder relative mode

G28 W ; home all without mesh bed level (cold zero to get PINDA low)
M104 S185 ; set extruder partial temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S185 ; wait for extruder temp

;M860 S35 ; wait for PINDA temp to stabilize (is this important?)

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 print area
G92 E0.0
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line
G92 E0.0
M221 S{if layer_height<0.075}100{else}95{endif}

RE: Extruder calibration?

M140 S[first_layer_bed_temperature] ; set bed temp << not needed, M190 both sets and waits for the bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp

M860 S35 ; wait for PINDA temp to stabilize  << this is essential, trust me

M104 S[first_layer_temperature] ; set extruder temp << again, not needed, M109 both sets and waits for the nozzle temp
M109 S[first_layer_temperature] ; wait for extruder temp

The lift and wait code in my first reply raise the nozzle off the bed, and helps prevent some cooking of the PEI surface.

RE: Extruder calibration?

Ok. I delete these lines.

You are right for for the lift code because I needed to make the lift manually. Your code is better, I add these lines.

For PINDA, I red this night that this is necessary to have a stabilized temperature but why this line isn't in the default firmware?

RE: Extruder calibration?

Posted by: philippe.b16

For PINDA, I red this night that this is necessary to have a stabilized temperature but why this line isn't in the default firmware?

Because, depending on the ambient temperature, the PINDA may never reach 35°C and thus the print would never start. The default gcode in Slic3r assumes that the printer has a properly calibrated Temperature calibration and thus preheating the PINDA is theoretically superfluous.

In reality, OCXOs work better than TCXOs, and so does preheated PINDA work better than a temperature-calibrated PINDA. So people who hack their gcode to get the best out of the printer prefer to wait for the PINDA to reach a preset temperature.

RE: Extruder calibration?

Votre explication est claire! Merci

RE: Extruder calibration?

The wait for PINDA to reach a temp is that the PINDA trigger range is temperature sensitive, and when the bed level runs, a print with a cold printer will require a different Z-offset than starting a print with a warm printer.  Even after a PINDA PID calibration, the PINDA is sensitive enough to cause issues in your first layer. 

Waiting for 35c pretty much ensures each print can use the same Z-offset.  Some who print hotter most of the time or have enclosures use 40c as their baseline.

RE: Extruder calibration?

Ok Tim. I make a preset for filaments with more hot temperature. Thanks

RE: Extruder calibration?

The PINDA wait has no on-screen notice: so if your nozzle and bed reaches programmed temperatures but the printer seems "stalled" give it five minutes.  I tried to use 40c with PLA temps, and was not able to get the PINDA that warm - even after 30 minutes.  I backed the temp down until the delay was acceptable and found 35c to provide a good and repeatable layer one print after print. Combined with the 7x7 mesh level, I haven't touched z-offset for months except for nozzle changes.

RE: Extruder calibration?

Finally, I set 33c because the time with 35c is more than 15mn.

RE: Extruder calibration?

Posted by: philippe.b16

Finally, I set 33c because the time with 35c is more than 15mn.

 

You might want to check the evenness of your bed's heating. I found the home (bottom left) position didn't get quite as warm as other positions, so I move the nozzle to the back-center and lower it for heating. It can still take a while on a cold day, but it's a little faster. Positioning it there also lets me inspect the print surface and do any last-minute adjustments.

RE: Extruder calibration?

Stupid edit time...

Prusa uses X=50, Y=50 for the warmup position as does the Prusa owner's wiki. Tailor to suit your printer environment. The warmer the spot the quicker it'll go.