after new print z height get's a +2.0

janko

So I have this really weird issue which i just can't get figured out.

The problem: when I start a print, all goes well. The printer starts with fixing the tilt on one plane, does a small ABL, primes and prints along, so far so good. However: after this print has finished and I want to start a second print, this print starts with a z height of +2 (eg: in stead of 0.2, because the first layer is 0.2mm, the printer starts on 2.2, which results in some nice airprinting no need saying ).

The samen happens when i cancel a print and start a new one. Restarting the duet completely solves it for the next print.

I have digged through the configfiles but can't figure out where that +2 comes from.

Configfiles for my Duet Wifi:
[0_1544888213532_download.zip](Uploading 0%)

My startup g-code is:

; Startup Gcode
M83
M140 S[first_layer_bed_temperature] ; set bed temperature
M190 S[first_layer_bed_temperature] ; wait for temperature
M104 S[first_layer_temperature]
M561 ; Clear any bed transform
G32 ; Do a single probe
G29 ; Load heightmap (you can use G29 S1 instead)
G1 Z20.0 F100 ; Move Z to 20
G1 X10 Y10 F900 ; Move Head to front left
M109 S[first_layer_temperature]
G0 X5 Y10 F9000 ; Go to front
G0 Z0.2 ; Drop to bed
G92 E0 ; zero the extruded length
G1 X40 E25 F100 ; Extrude 25mm of filament in a 4cm line
G92 E0 ; zero the extruded length
G1 E-1 F500 ; Retract a little
G1 X80 F4000 ; Quickly wipe away from the filament line

My End-gcode is:
G10 P0 R-273.15 S-273.15 ; Turn off Tool0
M140 S0 ; Turn off Bed
M109 S0
M106 S0 ; Object fan off
G1 X0 Y0 ; Move Z to Z210
G92 E0 ; Zero Extruder
G1 E-2 F300 ; Retract 2mm
G92 E0 ; Zero Extruder
M84 ; All motors Off

janko

and the fileupload is refusing a bit:

wetransferlink for the configfiles

dc42

Which firmware version are you using? Prior to firmware 2.01, homing Z while bed compensation was active sometimes caused a Z offset.

janko

Firmware Name: RepRapFirmware for Duet 2 WiFi/Ethernet
Firmware Electronics: Duet WiFi 1.02 or later
Firmware Version: 2.02RC2(RTOS) (2018-09-07b2)
WiFi Server Version: 1.21RC4(08b3)
Web Interface Version: 1.22.3

dc42

I don't recall an issue of that nature in 2.02RC2, but that's an old RC, so i suggest you upgrade to 2.02RC6. Also you should upgrade DuetWiFiServer to 1.21.

janko

@dc42 as soon as the current print is finished, i'll give that a spin and keep you posted here about the results

janko

@dc42 i think i finally found it When the ABL finishes, it puts the Z on +10 and starts moving to x20y20, when it reaches that point, the bed moves to z 0.2, but, the acceleration/speed of the Z-axis seemed to be too high, which made the motors skip steps. For the normal z-hop the acceleration is however no problem.

Seems adjusting the accelerationsettings solves it.

dc42

Thanks for the update!