This allows you to install your flight controller right above it. This is my very first 3D model I have ever created and as time goes on I'm sure I will be able to redo this and make it much nicer and cleaner. The cover is optional and can just have a few dabs of hot glue applied to the top. You may also add a bit of hot glue to the bottom of the OSD to secure it better. This was made using M3 Nylon/metal screws in mind which have an actual thread width of about 2.8mm, at least, mine do. The idea was taken from: http://www.thingiverse.com/thing:948118 but unfortunately the holes for his are exactly 3.0mm and all my screws don't grip anything which prompted me to do a complete redesign of it. I hope this is useful for someone. The spacers are 13mm tall from the base. I decided to upload one WITHOUT spacers so you could add your own spacer as well.