This is a fan shroud for adding a 40mm fan onto your Ubis 13 hot end. I use it on my Printrbot Simple Metal, not sure if it works for any other printer. Modeled in SolidWorks.Should work using most printer settings, printed mine at 75 (extreme speed!) mm per second. To install, just slip it onto your Ubis 13 hot end, and screw in your fan onto it.EDIT Until I re-upload a fixed file, you will need to resize and possibly rotate the model to be twice as small, or 40mm on the x and y axis