Hello all,

First post in this section... anyway...

I'd like to know if there is any facility in the Marlin firmware for any feedback on the absolute position of the X and Y axis as it is stepped? I have seen a bed auto levelling arrangement for the Z axis, which would be a absolute feedback above the bed, now I'd like to see if I could implement that for the X and Y axis.

I was thinking about wrapping a shaft in paper printed with black lines, like a barcode, wrapping it in matte sticky tape, and using an optical sensor, even a barcode reader, modified to suit. This would give me (potentially, firmware allowing) an absolute position of where in the X and Y space my print head happens to be, and confirm whether the steps taken as commanded by the GCODE have resulted in the right position. If not, adjustments are made until the head hits the right position in X and Y space.

Thoughts? Constructive critique? Abuse? (I'd rather no abuse...).

Thanks!

Boris.