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My CNC computer crashes a month ago and I just recently got it back up and running again. Unfortunately, I didn't make a hard drive backup andf I lost all my setting for the my Rostock Max V2. My 3d printer has longer aluminum extrusions, so it was out of spec from the original version, and so had some custom setting that I lost in the crash. Everything is working great except for one little thing. When I go to do a 13 point leveling, the print head will not move lower than 0 on the Z axis. Mattercontrol shows it going into the negative on the Z, but the print head will not get any closer to the print bed once it reaches 0 on the downward axis. It will go up in adjustments as high as I want, but I just not able to get it to get close enough to the bed to grip the paper sheet I have on there. I am using Arduino 1.6.1, the Rostock Max is a V2. Any help would be great. I fell like it is a just a simple adjustment that must be done in Matter Control.

The firmware won't permit you to travel to a -Z location. I'm not sure what in the firmware (if anything) you'd need to tweak, but unless you've had to re-load your firmware, any changes you've made should still be there.

g.

In the Seemecnc fork of Repetier, a line was changed in Printer.cpp to allow negative Z, from this:
to this:
It might be better to make the limit -3 rather than -100. Did you replace Seemecnc's tweaked firmware with regular Repetier?

Can't see to find the line of code
"allowed &= (z >= 0) && (z <= zLength + 0.05 + ENDSTOP_Z_BACK_ON_HOME);"

In the Printer.cpp in Repetier. I used the finder within arduino. Do you know where its at approximately?

Line 196, in firmware from https://github.com/seemecnc/Firmware has a minimum of -100. The same line in regular Repetier 0.92.2 is zero. Latest Repetier (1.0.1) is line 296.