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Not quite understanding z probe

Ben.folkes

Not quite understanding z probe
May 27, 2015 05:57PM

Registered: 9 years ago
Posts: 49

I'm trying to fix my friends cherry pi delta iii and when I home and then use G29 to z probe, everything looks fine and the nozzle then moves to 0,0,20. When I lower it by 20mm in the z so it should be at 0, I can see a gap between the nozzle and bed. Please could someone explain how I adjust this. Thanks very much.
Ben

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dc42

Re: Not quite understanding z probe
May 27, 2015 07:24PM

Registered: 10 years ago
Posts: 14,672

Measure the size of the gap, then in your firmware config increase the setting for the probe Z offset or trigger height by that amount. How you do that depends on what firmware you are running.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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Ben.folkes

Re: Not quite understanding z probe
May 29, 2015 03:46AM

Registered: 9 years ago
Posts: 49

Hi I'm using marlin and when I increase the z probe offset value even by 10mm, it makes no difference to where it thinks z=0 is after running g30. I'm really confused, does the z probe need to be deployed at the start of every print? Cheers for all the help