@schmart said in Pressure advance tuning with conditional G-code:
@cncmodeller said in Pressure advance tuning with conditional G-code:
@schmart feel free to use anything I've contributed.
Thanks! I took the liberty of integrating your suggestions.
Personally I was thinking the same way as you, two decent diameter thin wall towers and judge stringing and wall gaps on un-retract when starting a layer on each tower.
I came across this site which seems to offer an interesting approach to retraction tuning as well. For now, I hacked together a more classical attempt to tune retraction settings . Please see attached file Retraction.g.
I tested this on my printer, but still, please consider this a beta release.
@Schmart That's brilliant and it works fine on my machine.
I have added restart length variation as follows so you can run it twice once with zero restart increment to identify optimum retraction, then a second time with a good retraction length start value and zero retraction increment and a restart increment to get the optimum restart length.
See code changes below.
; Retraction restart length to start with
var retraction_restart_length_start = 0.0
; Retraction restart length increment for each (whole) millimeter print height
; e.g. if var.height = 20, var.retraction_length_start = 0.0 and var.retraction_length_increment = 0.05,
; then the retraction test range is from 0.0 to (0.0 + 20 * 0.05) => 0.0 to 1.0.
var retraction_restart_length_increment = 0.05
; Set firmware retraction
M207 S{var.retraction_length_start} R{var.retraction_restart_length_start} F{60 * var.retraction_speed} T{60 * var.deretraction_speed} Z{var.retraction_z_lift}
; Set firmware retraction
var retraction_length = {var.retraction_length_start + var.z * var.retraction_length_increment}
var retraction_restart_length = {var.retraction_restart_length_start + var.z * var.retraction_restart_length_increment}
M207 S{var.retraction_length} R{var.retraction_restart_length} F{60 * var.retraction_speed} T{60 * var.deretraction_speed} Z{var.retraction_z_lift}
; Output some statistics while printing
echo "Layer " ^ {var.layer} ^ " (" ^ {var.layer + 1} ^ " of " ^ {var.layers} ^ " at " ^ {var.z} ^ "mm)"
echo "Retraction length: " ^ {var.retraction_length}
echo "Retraction Restart length: " ^ {var.retraction_restart_length}
From memory that's all I changed. I can post my full file but it has my customisations for print settings and location.
Many thanks again!!
Cheers
Barry M
