Bigger build volume is a must 400x400x400 easy to outgrow the UM. 300mm is not a big change.
A complete revamp on support, biggest let down with the current UM2 is any overhanging surface turns ugly. Need a water soluble support so it can build a complete surface that can support the print. Not just lines or grids ( grid is near impossible to remove )
Dont expect to have any kind of working surface from areas with overhang.
Dual 3,4 or more extrusion points, largest print to date took 143hrs, way to long.
LCD screen much bigger one then current. You should be able to see a rotating 3D model of the part, as when you have many parts on the SD card you cant remember them all by name. Current screen you cant even read all the wording of the part if long.
Fully in closed climate controlled cabinet. Cant see any other way to ensure ABS can print without wanting to warp off the bed on big prints. The bed is warm but all the other material is cold and will pull the base material up.
Dont feed the material from the outside and over the top, have the material inside the machine so it can be enclosed. A little bigger who cares, i want great prints. Think Fortus 3D printer packaging.
UM2 is a great machine, but we can take it to the likes of Fortus with some more work and not blow the budget.
Filament measurement, but not just a number on the screen. Auto stop of print to change wire. Email alert that wire is out.
Live video feed to internet/phone app.
Temperature Alerts via email or phone app for safety
quick bed release, the metal tabs are not the best.