Improvements for the UM3, in order of preference:
1. Use the superior Olsson heater block, so we can swap nozzles easily.
2. Make the heater block and nozzle FAR more accessible for maintenance.
3. An extruder drive which straightens the filament and wipes it prior to feeding it.
4. A more slippery, slightly larger bowden tube so the filament doesn't bind up inside.
5. A more slippery and structurally strong replacement for the white plastic piece in the print head. Soooo, tire of replacing it every time it deforms.
6. A live streaming web camera, Ethernet, WiFi, and Octoprint built into the printer, so we can monitor prints on our tablets and smartphones from the couch.