@Veti said in Modified Ender-3 behaves strangely when starting to print:
M671 X-37:200 Y0:0 S10 ; Leadscrew at left connected to Z, leadscrew at right connected to E1
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X235 Y235 Z300 S0 ; set axis maxima
this does not make sene, this would place the second leadscrew inside your bed.
The z leadscrew position coordinates are a bit of mystery to me.
When looking at some examples, would the correct setup be:
M584 X0 Y1 Z2:4 E3; two Z motors connected to driver outputs Z and E1
M671 X-20:255 Y0:0 S0.5 ; leadscrews at left (connected to Z) and right (connected to E1) of X axis
M208 X-0:235 Y0:235 ; X carriage moves from 0 to 235, Y bed goes from 0 to 235.
and File bed.g:
G28 ; home
G30 P0 X20 Y100 Z-99999 ; probe near a leadscrew, half way along Y axis
G30 P1 X180 Y100 Z-99999 S2 ; probe near a leadscrew and calibrate 2 motors
When assuming, that the Z1 and Z2 leadscrews are positioned -20mm from X0 and
+20mm of Xmax, which is 235?
M564 H0 ; Allow unhomed movement
not a good idea to have this in your config.g
Without M564 H0 I could not home. Got an error immediately.
G31 P500 X30 Y25 Z2.94 ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20 ; define mesh grid
Yes, the first row was not reachable, that I know.
i would expect his to give you an error in the console about some points not being reachable.
M308 S0 P"bed_temp" Y"thermistor" A"Build Plate" T100000 B4138 ; Set thermistor + ADC parameters for heater 0 Bed
M308 S1 P"e0_temp" Y"thermistor" A"Nozzle" T100000 B4138 ; Set thermistor + ADC parameters for heater 1 HotEnd
your thermistor config is wrong. B4138 is the default. look up the correct value in your thermistor documentation.
I tweaked the thermistor settings a lot and the default was the only value, where I did not get errors
during heat up.
G29 S1 ; Load previously set bed map
OK, I will delete that.
this should be in your slicer start g code after the G28, because here you are loading the heightmap without establishing z=0
your bed.g is incorrect for dual z leveling setup.
on how to set up the bed.g
post the beginning of a generated g code from your slicer