I’m trying to drill a simple hole in my waste board! This is my first job! But the z axis won’t move below 0. I’ve tried changing some settings after reading different threads with no luck. I use a touch plate on z_min end stop and preconfigured marlin from v1.
I have checked this after reading your answer on a similar post. Unfortunately this was disabled in my configuration.h, so no luck there! I did however get the machine to start going negative by setting 0 with G92 command. It seems Z won’t go negative when I home it with the plate and crocodile clip.
negative is towards wasteboard. This is logical for me and also the right configuration with regards to the setup guide for the MPCNC. I have thought of inverting, but its not possible to enter negative values in ESTLCAM, so positive values converts to negative GCODE direction when creating the “print”.
It seems inverting this would cause a lot of headache using cam software:)
I had the same “problem” with my cr-10 after mounting an ABL sensor, but was able to go negative by changing #define Z_PROBE_LOW_POINT in the ABL section in marlin configuration.h
I’ll just use G92 and skip the homing of Z for now, but its kind of irritating not figuring out the problem;)
Don’t think of the actual motion, consider the result. The bed and head moving further apart is positive, getting closer together is negative. Same result achieved in two ways.
Under printer settings i have selected CNC router. By crown do you mean the “first print” in your guide? I have not tested with a pen, i went straight ahead to drill holes for wasteboard clamps!
I can go negative if i dont home z. Sorry if the erlier posts did not make that clear. If I home z its locked at zero and can only go positive. But if i home x/y and do G92 z0 the program goes negative when i print.
I am also able to do G1 Z-xx after homing z, but when running gcode produced by estlcam, or trying to go negative with manual control its locked at the homed position.