I wonder what would happen if one of the fixed wheels on top were replaced with an eccentric spacer, or both. seems then the tilt could be adjusted slightly if needed, perhaps on the order of half a mm ... only need to drill out the holes to take the eccentric spacer? I got my double extruder installed today, and checked with paper under them, seems both nozzles are very close to the same height off the glass .... but no print tests yet, still need to wire it all up.