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Have a Rostock Max V2 that I upgraded to the HE280 hotend and had 269mm arms on it. Been chasing some bed tilt issues and decided to throw on a set of 300mm arms that I have. Now I go to calibrate and the print head crashes into the bed. what do i need to change and where to get it back to where it will calibrate. I have changed the arm length in Configurations.H but I'm still crashing into the bed.

I am at work so I do not have any specifics, but I think while calibrating it first goes to a certain height and then starts probing. Because of the longer arms you mounted, the first stop, before it starts probing is below the bed surface. Have you tried setting z=zero the old fashioned way? Calibration just might work after you do that (and store it to eeprom).

What direction does it go when you ask it to home?

Doug68 wrote:What direction does it go when you ask it to home?

It homes correctly they only thing I changed was the delta arms. I have in the meantime swapped them back. Printer does fantastic within a small circle once you get 50 or so mm away from the center the bed tilt issue rears its UGLY head.

[img]http://forum.seemecnc.com/download/file.php?id=14010[/img][img]http://forum.seemecnc.com/download/file.php?id=14011[/img][img]http://forum.seemecnc.com/download/file.php?id=14009[/img]

That looks like ABS peeling rather than an arm issue, it'd be curved on top also if it were an arm issue?
In the EProm settings there's the arm length value, did you change that to match the new arms?

Doug68 wrote:That looks like ABS peeling rather than an arm issue, it'd be curved on top also if it were an arm issue?
In the EProm settings there's the arm length value, did you change that to match the new arms?

Problem is EVERY print I do is showing low between the X and Z tower when you look at the first layer it looks great between the Y and Z tower and has little to no bed adhesion on the X/Z side. The print lines are perfect and the quality is really rather nice and if I stay less then 50mm from the center there is no lift issues. Mechanically the build is solid with XYZ endstops having been zeroed and it holds day to day. When doing the G29 probe it shows Z probe height difference of .01mm after three iterations. Doing a 20mm calibration cube with 269mm trick laser carbon arms the printer is dimensionally accurate with a 270mm diagonal arm length. Aside from the bed slant I don't think I could get this printer printing nicer. This is why I'm so frustrated