Help with bed attacking nozzle.
I've posted a couple times about this before but I still haven't been able to find anyone who knows what the problem is. Everytime my start gcode ends my printer jambs the bed into my nozzle. I know my z offset is correct. I've set it up 100 times using every video. I don't know if something in my start gcode is broke, but I've tried quite a few iterations and none of them have changed anything. It's just that everytime it's done printing the 2nd purge line its go GRRRRRK and then jambs the nozzle directly into the bed before it starts printing the skirt. Can anyone offer any advice. Here's my start gcode
M104 S{material_print_temperature_layer_0} ; Set Extruder temperature
M140 S{material_bed_temperature_layer_0} ; Set Heat Bed temperature
G28 ; Home all axes
M420 S1
M900 K0.1
M500
M190 S{material_bed_temperature_layer_0} ; Wait for Heat Bed temperature
M109 S{material_print_temperature_layer_0} ; Wait for Extruder temperature
G1 F1800 E-3 ; Retract filament 3 mm to prevent oozing
G92 E0 ; Reset Extruder
G1 Z5.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
G1 Z5.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
It's an Ender 5 with Microswiss and BL Touch installed using the BL Touch as the Z end stop. TH3D firmware.
EDIT:
Problem solved by u/MurkyIncident feed rate was way too high and was causing the whole thing to skip z steps.
Posted Jan 29, 2022, 8:51 PM UTC · edited
The point that it jams is just after the start gcode, so likely something to do with how you're setting z offset or another slicer setting.
Can you describe how you set z offset? Also, is it possible that there is a z-offset set in cura?
Ive tried every z offset method I can find. I get the same number but everytime the print starts it just jambs the nozzle into the bed. In between the start code and the start of print it makes a weird grrrrk noise but theres nothing set in cura Im aware of. I would think the offset could be the problem but even if I babystep it correct the next time it prints its off again.
Babystepping doesn't save, either gotta update the firmware offset or set it in start gcode.
It seems like it saves after m500. Since if I look up ny z offset its the new value
Only if you modded firmware from stock to enable BABYSTEP_ZPROBE_OFFSET.
[deleted]
Try changing the offset in firmware to something high, like not even print on the bed high.
If it doesn't update, you may need to consider how you're saving the offset.
But still, what is the latest method you have used to set z offset. This screams z-offset issue, so pardon me for asking again, but saying "I've tried everything" doesn't help us help you troubleshoot your situation.
Most recent method was following a youtube video someone else had posted here as a how to set z offset. https://youtu.be/mwbbfCugDek Ive also tried using the marlin auto z offset setup and got same number. -.195