This is a weapons pylon for use with the Freewing 90mm F-16 weapons attachment hardware Sku: FJ306110916. I am using it on the fuselage of my A-4 and A-10. You could probably use it on any aircraft with a flat bottom wing. This one is also not scale. I just drew it to a size that looks about right. If you use it as a wing pylon please make sure that it does not interfere with the movement of any flight surfaces.
The QIDIPrint app added supports for the attachment pocket that touched the build plate but not the top one.