Can you use duet wifi without z probe at all?



  • Hello. I have custom h-bot with z max endstop. Also I have duet 2 wifi which I used for sometime. Now I want to use it again but I don't want to install z probe because I'm used to manually level the heat bead and I don't require any of auto leveling tools.
    So my question again - can I configure duet 2 wifi to print without any z probe?





  • The only thing you need is to home your printer, so it knows where Z=0 is. If you home on high endstop, you need to provide it the correct value, so z=0 is at the correct height above the bed.

    I don't use any probe (I have a very flat and rigid bed), but my (low) Z endstop can be tuned with a screw, to adjust zero - which I don't do very often, mainly when switching from PLA (cold bed) to ABS (hot bed)...



  • @veti it's manual probing. Can i just set length of my Z axis (260 mm), so if I have z max endstop I can home to Z0 without probing because board knows that 260 mm is Z max?
    It works like that on other boards.



  • yes in the configurator https://configurator.reprapfirmware.org/Endstops just select endstop like for x or z instead of probe and endstop location at high end.



  • @arty said in Can you use duet wifi without z probe at all?:

    @veti it's manual probing. Can i just set length of my Z axis (260 mm), so if I have z max endstop I can home to Z0 without probing because board knows that 260 mm is Z max?
    It works like that on other boards.

    Exactly.



  • We don't even really need a switch, but that lets us set the Z height once and use the same one every time. Without a switch or probe, we could simply send G92 Znnn at a known height.



  • On my previous printer (OrdBot Hadron), I had no endstop at all, and always used this technic.

    I installed endstops when I sold it 😉



  • Why would you want to use a Zmax switch instead of a Zmin switch? Setting up a Zmax switch would be time consuming and/or hazardous to your hot-end/print surface. With a Zmin switch, you can tweak it a bit to approach zero, test, and tweak, very quickly with minimal risk of crashing the nozzle into the bed.



  • @mrehorstdmd I know you didn’t ask me, but I Home Z to max.

    Sure it may be slightly less convenient, but my z axis moves surprisingly quick for a screw drive so it’s not overly inconvenient.

    As for benefits, it was simply easier than figuring out a reliable way of probing the bed. I will just set the z height manually. Once you have the z height set, homing min or max really makes no difference, does it?



  • Homing to z max is fine as long as you have you M208 axis maxima measured accurately.

    You can setup a macro to measure it accurately by jogging the nozzle to z0 and using g92 z0 to set it and then moving to the max endstop. The distance moved would be in m208.



  • have you tried used motor stall detection? no endstops needed on the duet wifi.


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