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Hello,
Okay I know there are a lot of these issues related to calibration, but maybe this one is different: So yesterday I was reading the latest manual and got to the calibration of the three towers based on setting "Z" height off the center of the heated plate. So I did this and when I went to set each axis, the brass nozzle slammed into the glass. The instructions in the manual said to jack with the screws on top of each roller skate, but I didn't want to take a chance of breaking something. So today, I calibrated off a gauge block to keep the nozzle away from the glass. I set the X, Y, and Z heights very close,and then ran the "bed center" macro finding the brass nozzle to be up by 2mm or so. Basically, when you set the nozzle at .003" above the center of the heated plate, and then go to move towards one of the towers it will drag into the glass.

I don't understand how this is possible, hopefully there is a cure for my issue.

Thank you,
Cris

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Using the gauge block will definitely help you now and in the future. Basically you want to set your overall z height to the gauge block in the center using the LCD. Then hit each XYZ macro and adjust the end stop screw until the nozzle touches the gauge block with the same resistance at each tower. Then test the center macro and adjust the Horizontal Radius in the EEprom in MatterControl (or whatever your using) to raise or lower the the nozzle. Each time you change that value, you'll have to re-calibrate each tower again using the same method above.

Eventually each of the towers and the center will hit your gauge block with the same resistant to be considered calibrated. This will take a long time. Then you can go back through the LCD and set your over all Z height to a sheet of paper.

The flow chart on page 241 should help explain it a bit. Each time you change the EEPROM Horizontal Radius, you'll have to adjust each tower before you notice a difference in the center.

This topic should help as-well. Kind of the same issue.
http://forum.seemecnc.com/viewtopic.php?f=37&t=7455

Kas,
Thank you for the reply. Oddly enough I did use a gage block to avoid slamming the hot end into the glass It helped me discover the center being out of whack with each of the columns. Good to hear there is a fix for this condition, cause I couldn't figure out why the Z axis was changing as I moved the hot end in both X and Y directions.

Cris

Don't set your macro to z0, set it a few mm above to start.