Extruder not heating during probing

3d Printing / Slicers / Setup / Problems
1

I don’t think I had this issue when using the BLTouch but with the EZABL while it’s probing the extruder heater turns off, drops to around 185 degrees from 200. Guess it could be something in the firmware doing it.

G90 ; use absolute coordinates
M83 ; extruder relative mode
M104 S[first_layer_temperature] ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
;M109 S[first_layer_temperature] ; wait for extruder temp
G28 ; home all
G29 ; auto bed levelling
;M420 S1 Z2 ; ABL using stored mess
G1 Z10 F240
G1 X2 Y10 F3000
G1 Z0.28 F240
M104 S[first_layer_temperature] ; set extruder temp
M140 S[first_layer_bed_temperature] ; set bed temp
M190 S[first_layer_bed_temperature] ; wait for bed temp
M109 S[first_layer_temperature] ; wait for extruder temp
G92 E0
G1 Y190 E15 F1500 ; intro line
G1 X2.3 F5000
G92 E0
G1 Y10 E15 F1200 ; intro line
G92 E0
2

As I understand it, this is by design, to prevent the heater circuitry from inducing interference in the EZABL circuitry.

3

Yeah, the frequently on/off switching of the heater caused trouble with bad shielded sensors in the past.

Since the cables are in parallel and have no real shielding from each other, it is likely sensor information gets compromised.

4

That does make sense and my EZABL hasn’t failed a prop yet. Can’t say that about the Bltouch