Richard,
I found the issue with my 3DR simple, I believe. I gave up on it for a while and built a MK from ultibots that prints fantastically. During that build, I decided to print a "torture test" model on the Cupcake CNC that I had used to print both of the frames on the 3DR simple. Well, after the torture test model was complete, I examined it and found that the square box was out of square. My X and Y axes aren't square to each other. It's a real punch in the gut to know that this has existed. I think I will build a Z-probe for it and attempt to use Rich Cattel's auto calibration firmware. If that doesn't work then I'll print a new frame on the MK and try one last time! IF that doesn't work then the parts are going into a Tantillus!
for what it's worth, I was able to calibrate the MK in about an hour manually. I haven't fine tuned it like you have yours. I just don't see that I have a need to get that good with it.
I found the issue with my 3DR simple, I believe. I gave up on it for a while and built a MK from ultibots that prints fantastically. During that build, I decided to print a "torture test" model on the Cupcake CNC that I had used to print both of the frames on the 3DR simple. Well, after the torture test model was complete, I examined it and found that the square box was out of square. My X and Y axes aren't square to each other. It's a real punch in the gut to know that this has existed. I think I will build a Z-probe for it and attempt to use Rich Cattel's auto calibration firmware. If that doesn't work then I'll print a new frame on the MK and try one last time! IF that doesn't work then the parts are going into a Tantillus!
for what it's worth, I was able to calibrate the MK in about an hour manually. I haven't fine tuned it like you have yours. I just don't see that I have a need to get that good with it.