Strange behaviour after mechanical modification

General Discussion
1

Basic Information:

Printer Model: Ender 5+
MCU / Printerboard: BTT octopus 429; EBB42 toolhead
klippy(1).log (5.5 MB)

My printer worked fine for a year, but I had a lot of banding.

I got a belt upgrade kit for the Z axis, after installing it i modified my config to one z motor and took out the Z-tilt option.
I also replaced my 0.6 by a 0.4mm nozzle.

After this, my printer behaves very weird. It doesn’t matter at what temperature I slice a gcode file, it always warms up to 205°C, after the START_PRINT it goes to 190°C. temps I cannot modify from mainsail, but on the klipperscreen I can still change them…

When the printer is idle, I can set the temperatures from mainsail.

I cannot find where this behaviour comes from…

2

It is because [START_PRINT] puts it 190°C again:

[gcode_macro START_PRINT]
gcode = 
	{% set X_MAX = printer.toolhead.axis_maximum.x|default(100)|float %}
	{% set Y_MAX = printer.toolhead.axis_maximum.y|default(100)|float %}
	{% set Z_MAX = printer.toolhead.axis_maximum.z|default(100)|float %}
	{% set NOZZLE = printer.extruder.nozzle_diameter|default(0.4)|float %}
	{% set FILADIA = printer.extruder.filament_diameter|default(1.75)|float %}
	{% set X_START = 10.0|default(10.0)|float %}
	{% set Y_START = 20.0|default(20.0)|float %}
	{% set PRIMER_WIDTH = 0.75 * NOZZLE %}
	{% set PRIMER_HEIGHT = 0.70 * NOZZLE %}
	{% set PRIMER_SECT = PRIMER_WIDTH * PRIMER_HEIGHT %}
	{% set PRIMER_VOL = PRIMER_SECT * (X_MAX - 3 * X_START) %}
	{% set FILA_SECT = 3.1415 * ( FILADIA / 2.0)**2 %}
	{% set FILA_LENGTH = 1.55 * PRIMER_VOL / FILA_SECT %}
	{% set BED_TEMP = params.BED_TEMP|default(60)|float %}
	{% set EXTRUDER_TEMP = params.EXTRUDER_TEMP|default(190)|float %}    # <---
	M104 S{EXTRUDER_TEMP} T0
	M140 S{BED_TEMP}
	G28
	G1 Y{Y_MAX - 20} Z{Z_MAX/4.0} F6000
	M190 S{BED_TEMP}
	M109 S{EXTRUDER_TEMP} T0   # <---
	G92 E0
	G1 X{X_START} Y{Y_START} Z{PRIMER_HEIGHT} F3000.0
	G1 X{X_MAX - 2 * X_START} Y{Y_START} Z{PRIMER_HEIGHT} E{FILA_LENGTH} F2000.0
	G1 X{X_MAX - 2 * X_START} Y{Y_START + PRIMER_WIDTH} Z{PRIMER_HEIGHT} E{FILA_LENGTH}
	G1 X{X_START} Y{Y_START + PRIMER_WIDTH} Z{PRIMER_HEIGHT} E{FILA_LENGTH} F2000.0
	G92 E0
	G1 Z2.0 F600
	G1 Z0.2 F600
	G1 Z2.0 F600

Same is for bed with 60°C

You may kick those lines out.

Honestly, there a pre made configs out there with way too much stuff that do way too much nonsens.

3

Thank you for your reply, I will remove those lines and see what happens.

But why has it worked for a year? I never had these issues before…

4

I really can’t tell. Maybe a change in the slicer startcode settings?

:man_shrugging: