Solved Inverted Z Axis Endstop Logic

I recently installed MatterControl 1.3 on my MacBook Air running Mac OSX. I am having an issue with homing my Robo3D. The end stop logic is inverted. Is there a simple way to flip the end stop logic to home the z-axis?

 

Are you sure it's inverted and not just improperly seated?

Did you flash a different firmware on it?

 

Haven't touched the firmware. I double check the seating, and that is perfectly okay.

When I home the z axis the print head moves in the positive z direction (up). However, if I manually lift the printhead off of the end stops, and then press home z, it moves in the negative z direction (down) and the instant I drop the print head and the endstops engage, it homes.

 

Try flashing the firmware:
http://guide.robo3d.com/Wiki/ROBO_3D_Firmware_Release_Notes

 

I had this problem on my original Robo 3D R1 after installing the latest firmware.

When I checked, it says Z min endstop is always triggered. When I press it manually, it says it is open.

Changed this line in the firmware (configuration.h):
was:
const bool Z_MIN_ENDSTOP_INVERTING = true; // set to true to invert the logic of the endstop. //robo

Which is the opposite of all the other switches. Now set to:

const bool Z_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop. //robo