Summary This is a enclosed mount for the Rumba board the is a fit for the UM2 (Ultimaker 2) clone, the Jenny printer. It fits a 50mm fan and the cover simply pops on. I don't know for sure if this fits the UM2 since this is for a clone and the printer wall may be different. I included the original 123D file so you can modify it for your printer. Print Settings Printer Brand: Ultimaker Printer: Ultimaker 2 Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: .1 Infill: 30%