Update: Knob added. It should fit on an ALPS encoder with a 6mm shaft. My 20x4 LCD display broke, so I ordered a new one. This time I decided to order an OLED display, because it looks cool. I was fed up with the way I had a separate jogwheel, SDRAMPS and display. I decided to cram it all into a single, new box. The OLED display is a little thinner than the LCD, and I felt it needed a little protection. A piece of Plexiglas cut to 84mmx32mm can be mounted in front of the display module. The design is untested, but it should all work. My Mendel is still printing it at the moment, so I can't tell if it will all fit well.