To be able to better control the temperature inside the Ultimaker 3 I created this simple front door.
It is based upon a 3mm acrylic glass plate (size 325 x 325 mm2) and two top hooks, a handle and a bottom hook. The parts need to be glued together with a suitable plastic glue.
During printing the door covers the front side of the UM3. If not needed, it can be hung at one of the printer sidewalls.
The basic design should fit the UM2 also, but I'm not sure about the wall thickness, which seems to be different between the UM3 and UM2.