Here is my Tripod Mount for the DJI Osmo Action (GoPro should work the same way)
I use the BambuLab PLA CF for the great surface and stability!
You need to melt two thread inserts (¼" - 20x12,7x8 in the Base for the Tripod) / (M5x6x7 for the Osmo Action Mount Screw)
Link to melting thread inserts
Please give me feedback