Topics created by nickt

@stephen6309 said in G28 Z probe off set:

@nickt Add a G1 line that moves the probe to a safe place, like the center of the bed.

... to your homez.g file and to the Z homing part of your homeall.g file. See https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCartesianPrinter#Section_Homing_Z_using_a_Z_probe for examples.

@supraguy said in Is head movement defined in mm ?:

@danal yeah, I get that, and basically the OP question was answered by dc42 (Which I also reiterated at the bottom of my post)

Just really, when you tell the printer to move 1mm, what the firmware does instead is say "I'm going to send x number of pulses to the stepper motor driver with the forward direction set."

Agreed!

However... When the printer is told to move 1 unit, it sends many MORE pulses if there were a prior G20 than a prior G21.

You may find this of interest to you, particularly the section on finding your steps per MM: https://duet3d.dozuki.com/Wiki/Going_from_Marlin_on_Arduino_to_RepRapFirmware_on_Duet

I agree that 4000 for the Z axis seems a little arbitrary.

Give these a read if you haven't already

https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_BLTouch
https://duet3d.dozuki.com/Wiki/BLTouch_Troubleshooting
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe
https://duet3d.dozuki.com/Wiki/Setting_up_automatic_probing_of_the_print_bed

You can use a common wire for the two BLTouch ground connections, but I recommend that you keep it separate from the wiring to the 24V devices. Otherwise, a broken ground connection or a wiring fault could feed 24V into the BLTouch or the Duet.

You can use a common +24V wire for the heater cartridge and both fans.

Sorry typo , yes extruder heat up , I have tested every thing with the M302 ( for speed ).
Many thanks and more questions to follow ( new subject bl touch )