So I have tried several cheap action cameras on my 3DR Solo drone with out a luck connecting it to the HDMI and having it work. However tried the ThiEYE V5s (see more here: http://amzn.to/2hqofX7 )which is a super cheap yet high quality 4k action camera and I had winner but needed to mount it to the 3DR solo and it didn't fit the GoPro mount which came with the drone. In the past I had used very cool design sj4000 wifi 2 sided frame (https://www.thingiverse.com/thing:633830) which success as it seems to fit most chinesse action cameras out there and it fit the ThiEYE (see more here: http://amzn.to/2hqofX7) with one exception. The HDMI could not plug in, so I did a minor remix and wham-bam its a winner for a chicken dinner and has been working great so figured I would share it!
Also check out the video here: https://youtu.be/xGF1punQPEY for more details and other mods for the 3DR Solo. Also not this will adapt the ThiEYE to just any Gopro mount style drone so its not limited to the 3DR Solo...
Major Favor: if you make one of these please post the Make and share it with the community :-) .
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I have tried a number of materials and the best I have found for this is ABS or HIPS as PLA is too ridged and TPU to flexible. Also 0.2 layer height is best for a lot of layers since the frame is thin.