Next problem to deal with is the head alignment, or rather to use the correct term if you want to find info on it, nozzle alignment. This is to get the two heads to print in the same place.

In RepG under onboard preferences you can find x and y head alignment and you can put the distance between the nozzles into the x parameter dialog box. I measured the distance with the calipers which turns out to be about 33.05mm. After that run the RepG nozzle calibration and pick the line which is aligned best then enter this in the nozzle calibration entry on the printer. Incidentally the printer will always show 7 when you recheck this but if you go back to the onboard preferences dialog you will see it has changed there.

During this process I found that the left feed was becoming worse and worse until it wasn’t really feeding at all.