Polar bed homing.



  • Hi all.
    My polar build is almost ready for the electronics!

    Id like to be able to home the rotating bed to allow me to orient to print on a laser cut first layer, and also use the restart on power failure feature. As such I will need a bed rotation home switch.

    When the polar printer configuration was created what hardware was envisaged for the bed rotation home switch?

    I was thinking about a hall effect sensor but didn't know if it being triggered every rotation would be an issue?

    Also does bed mapping with a bltouch work on a polar printer? If so what is the maximum bed deviation it can allow for? My bed is 600mm dia sheet aluminium and it has enough warp to be an issue. I will probably mount a sheet of glass on it after initial testing, but would like to dilo initial tests with pla on kapton tape.

    Any thoughts would be much appreciated.

    Many thanks
    Barry M



  • It will work fine to home the polar bed, triggering while printing doesn't do anything.

    You could use an optical fork-style endstop mounted on the frame with a flag on the bed. They are cheap and work very well (unless you are in direct sunlight).

    You might have to edit homeall.g and make a homebed.g to move the bed to home.

    Add something like:
    G1 S1 Y-360 F1000 ; Rotate counterclockwise, up to 360 degrees.
    G1 S2 Y2 F1000 ; go back a bit
    G1 S1 Y-4 F120 ; approach slowly


  • administrators

    @cncmodeller said in Polar bed homing.:

    When the polar printer configuration was created what hardware was envisaged for the bed rotation home switch?

    I was thinking about a hall effect sensor but didn't know if it being triggered every rotation would be an issue?

    As @bondus said.

    Also does bed mapping with a bltouch work on a polar printer? If so what is the maximum bed deviation it can allow for? My bed is 600mm dia sheet aluminium and it has enough warp to be an issue. I will probably mount a sheet of glass on it after initial testing, but would like to dilo initial tests with pla on kapton tape.

    Yes, bed compensation should work.



  • Thanks for the info. Hopefully I will be putting it all together this weekend.
    Many thanks
    Barry M


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