With my new Skywalker 1800 2014 (fpvmodel) I wanted to mount the video transmitter inside of the fuselage to protect it from crashes , weather and heat when the plane is stationary. I fitted a 40mm fan (31.5 mm mounting hole spacing) that can activly cool the vtx. It can take 12V and consumes around 60mA. P.S. the clip on bottom that you see in the Solidworks assambly does not fit the actual part (I did not include the .stl file of the bottom clip) . Want me to print your 3D part ? Visit: http://www.3dhubs.com/arnhem/hubs/spikee Want to donate ONE dollar for my work ? Goto: http://goo.gl/hVsLs0Printed on Ultimaker 2 on lowest quality settings.