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Marlin Z safety while auto bed leveling

Posted by RedWagon 
Marlin Z safety while auto bed leveling
May 26, 2014 02:53PM
I have auto bed leveling setup on my Reprap and it's working well except I have a very tight range in which I can start in. If the print head is too high the Z software limit is hit before the limit switch touches the bed. I tried throwing a G92 Z100 before G29 so it would hopefully keep going down until the limit switch was hit but instead it crashed into the bed without lowering the probe. Any ideas? I'd like to be able to hit print from any height instead of having to manually move the extruder each print.

I pulled this version of Marlin from git a couple weeks ago, not sure where to find the exact version number....

My configuration.h is here:
[github.com]
Re: Marlin Z safety while auto bed leveling
May 27, 2014 12:43PM
G30 lowers the arm immediately so I came up with a workaround that uses G30 on an arbitrary point to get the Z axis within the range for G29 to work.


G28 X0 Y0
G91
G1 Z10 F200
G1 X50 Y20 F6000
G90
G92 Z100
G30
G92 Z5
G28 X0 Y0
G29
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