I switched from rep g to makerware. Native support of dual extrusion is nice. It can easily print with ABS from one extruder while using dissolvable filament (HIPS) from the other for raft and support. The only thing I don't like is that it keeps defaulting to 90/150 speed and I have to reset it by hand for every print. (Tried to write a custom profile but didn't have much luck. I may be missing something.) Got a roll of HIPS from Amazon. Ordered d-limonene from Amazon too, but it's traveling to California from Indiana via UPS ground, even with Prime (hazmat restrictions?), delivery forecast is 2/19. In the mean time, got a big bottle of "orange oil" from a local agricultural supplies store, supposed to be 90% d-limonene. It's a bit more expensive but it seems to do the job, slowly (a couple of hours of soaking mixed ABS/HIPS parts in orange oil turns HIPS into viscous goo, which can be cleaned out manually.)