FRSky XM+ mount
thingiverse
I've designed it specifically for Martian II, but it's mounted on top from FC, 30.5x30.5. Therefore, I believe it will work on many frames. The holes for antennapipes are 3mm. To be honest, I'm not satisfied with the design as is, since a "normal" PDB won't work on Martian II, so I've designed two alternative versions, but I have to wait until my screws arrive before posting mounted pictures. Version three features a spacer-to-spacer mount, 32mm in size, allowing for stacking on IRC and/or OSD. However, I'm facing the same problem – I'm not satisfied with this design either.
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