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I have installed mine onto a PICA revB board (http://community.reprapwilson3d.com/t/i-designed-a-new-rendition-of-ramps-called-pica/167) which runs a forked marlin 1.0.4 by mjrice (https://github.com/mjrice/Marlin) I am running 1.75 filament and although I have calibrated it and set all my parameters I am getting 2.2 as my dia when connected to the MB using pin 12 which was a temp in pin.

If I disconnect the Out pin I get the proper size aprox 1.5v on my multimeter but as soon as i connect it i get 2.2v. I have run a print and watched the filament being measured but in the 2.33 range. the factor is always 100% and never changes.

I am in contact with the board maker (Mjrice) and waiting a reply but is there anything else I should try in the meantime... anything obvious from what I am describing here?