I am looking to buy a 3-d printer. I am a mechanical engineer and plan on printing a lot of moving parts. I'm torn between two printers. The flashforge creator pro for its cost and dual extrusion or the ultimaker 2. I don't like the flashforge build size, but as a novice I don't know if I can live without dissolvable filament. How important is it to have dual extrusion capabilities? How limited am I without having dissolvable filament? Thanks for any advice.