I recently bought and assembled a delta kit. I am trying to set it up so the z height is close to where it should be - in other words, 0 = 0. At first when I check M114 after homing, it returns Z:545.40. I lowered the print head manually, and when it is about 1mm from the print surface, M114 reads Z:255.40.

I pulled up the firmware, and #define MANUAL_Z_HOME_POS 295.4 is what is showing. I subtract the 255.4 from this and enter MANUAL_Z_HOME_POS 40 and upload it.

Now at home, M114 reads Z:290.0. This is the distance from home to the print surface, so I think I am good. The problem is, now when I lower the print head, it will not go below Z:250.00. It just stops and will not let me manually lower it any further.

Any ideas on what I am doing wrong?