Roland SP300 sub printing
It may ruin your heads? NO it will ruin your heads you cant put sub ink through a machine that was previously running eco solvent. You need to start with a new machine or go through and replace every part the ink touches down to the cartridge holders, ink lines, dampers, heads, capping station, pump on that machine. Ive done it before but its very costly and I wouldn't recommend it on a 30" machine the conversions I've done were on 54 and 60" printers. Hope that helps