Varia RCT715 mount

This is a mount for the Garmin Varia RCT715 bicycle rear camera, light, and radar.

It is still a bit rough around the edges- read: this is only my second iteration, and haven't really used it either- and the dimensions are not very precise, but probably still more precise than my printer. Unlike my [old style cleat](https://www.thingiverse.com/thing:5849643), this does not require any disassembly of the varia. However, I still strongly recommend attaching some kind of tether to the varia in case the mount fails.

Print one each of the twist lock, cleat holder and, optionally, post mount. Print three of the standoffs. Supports are not necessary. Also needed are three M3 screws at least 12mm long to hold all the parts together and two zip ties to attach the mount to a seatpost. Optionally, the mount can be bolted to other bike attachment points besides the seatpost mount.

To assemble, the cleat holder slides into the twist lock, three M3 bolts go into through the holes in the cle