This bracket is based on another model of mine, based on the mounting bracket delivered with Moon lights.
This version has the advantage that it has less parts and therefore is easier to print and assemble. If you want to be able to change the horizontal agle of the mounted assessors, you will need the previous version. You can still find it here:
https://www.thingiverse.com/thing:3350991

The bracket can be mounted on the handlebar or, without the inlay, around the front suspension of an mountainbike.

Connectors

Here is a list of connectors I could find on Thingiverse. I did not test them (all) so let me know if there are bad ones in the list.
If you know other compatible connectors, let me know and I will add them to the list. If one of the connectors fits other lights, cams, ... also let me know so I can update the name.

Cams

• Flir Breach: https://www.thingiverse.com/thing:3165421
• Osmo Pocket: https://www.thingiverse.com/thing:3287304
• Shimano CM-2000: https://www.thingiverse.com/thing:3180877

Lights

• Ayup: https://www.thingiverse.com/thing:2556142

• Bigo: https://www.thingiverse.com/thing:3290332

• Blackburn Central: https://www.thingiverse.com/thing:2589659

• Blackburn Torch / Torch2: https://www.thingiverse.com/thing:3351996

• Bontrager Ion: https://www.thingiverse.com/thing:3235715

• CatEye Volt 350 / 800 / 1700: https://www.thingiverse.com/thing:3332808

• Convoy S2 / S2+: https://www.thingiverse.com/thing:2988601

• Cygolite Expilion: https://www.thingiverse.com/thing:2938653

• Cygolite Metro: https://www.thingiverse.com/thing:3332811

• Exposure Trace / TraceR: https://www.thingiverse.com/thing:3147078

• Garmin: https://www.thingiverse.com/thing:3026543

• Magicshine: https://www.thingiverse.com/thing:1894777

• Magicshine MJ906: https://www.thingiverse.com/thing:3308857

• Nestling X3 Cree: https://www.thingiverse.com/thing:3243380

• Nitecore EA41: https://www.thingiverse.com/thing:3141636

• Niterider Lumina: https://www.thingiverse.com/thing:1498626

• Petzl Tikkina / Tikka / Zipka / Tikka Plus / Zipka Plus / TacTikka / TacTikka Plus / Tikka XP / TacTikka Xp: https://www.thingiverse.com/thing:3352810

• Petzl kit adapt: https://www.thingiverse.com/thing:3010407

• Princeton tec yukon: https://www.thingiverse.com/thing:3352161

• RioRand: https://www.thingiverse.com/thing:2587685

• Yingding: https://www.thingiverse.com/thing:2702398

• round light radius 12mm: https://www.thingiverse.com/thing:3195072

Bike Computers

• Garmin: https://www.thingiverse.com/thing:3026543
• Polar m450 / v650: https://www.thingiverse.com/thing:3230916
• Wahoo: https://www.thingiverse.com/thing:3348826

Sports-watches

• Polar m400: https://www.thingiverse.com/thing:2496623

Smartphone

• Otterbox case (iPhone / samsung / OnePlus / Google / Huawei / Microsoft / LG) : https://www.thingiverse.com/thing:2877520
• Rockform case (iPhone / Samsung): https://www.thingiverse.com/thing:2986273
• Topeak Ridecase: https://www.thingiverse.com/thing:3125885
• Universal: https://www.thingiverse.com/thing:2194278

See also

I also made a system to mount things underneath the saddle using the Gopro system. This already has a much wider range of compatible connectors, so check it out!
https://www.thingiverse.com/thing:3259364

If you are interested to go even further standardizing your connectors in house, in your 3d-printer, in your car, ... you should checkout the modular mount system with a lot of remixes.
https://www.thingiverse.com/thing:2194278