3 motor bed leveling and z_max endstops
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Is it possible to use 3 z_max endstops to z home when using the 3 motor bed leveling setup on a core xy system? Has anyone done this?
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Several users have used 2 leadscrews and 2 Z endstops, and I see no reason that you can't extend it to 3. However, an easier way is to use the Z probe to probe near the leadscrews and have the firmware compute the individual leadscrew connections. See https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors.
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@dc42 I think he wants to home at Z max.
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@jackatom74 In the same manner as some people have done to use more than one driver to drive two lead screws for X or Y axis, you can split the Axis in Z,U,V for homing, each with their own endstop. Once that part of the homing is complete they can be combined back into three drivers allocated to Z and then the normal leadscrew compensation using a probe can be carried out as @dc42 mentioned in his post.
What I don't understand is why? Why not go straight for the 3 motor autolevelling?
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@t3p3tony maybe I am just not understanding something correctly. In my mind if I could home z_max on each screw, it would give the machine a known place to go to after a power loss when there is a print on the bed already. I still want to use the auto leveling and that map could be reloaded at that point. Is there a better way to do this? Or how is this achievable with the Z_probe as Z_min end stop.
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@jackatom74 said in 3 motor bed leveling and z_max endstops:
@t3p3tony maybe I am just not understanding something correctly. In my mind if I could home z_max on each screw, it would give the machine a known place to go to after a power loss when there is a print on the bed already. I still want to use the auto leveling and that map could be reloaded at that point. Is there a better way to do this? Or how is this achievable with the Z_probe as Z_min end stop.
Your are absolutely right. If you want to resume after a power failure with a print still on the bed and with a CoreXY, you have to home to Z max.
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@jackatom74 Yes, this is the way to achieve that.
