I tried printing a remixed design for an Ender 3 GoPro mount by user bkopanja, but the mount was too wide and hit my 3DTouch/BLTouch sensor during x-axis homing. I designed a quick fix which is narrower and allows the x-axis to home without hitting my BLTouch or hotend carriage.
Print flat on your print-bed with the GoPro mounts facing upward. No supports needed.
Hope you enjoy it!
3D Solutech PLA