Modular base remixed from the excellent phone holder created by twilliam based on DWONH's design.
There are three versions:
No cold shoe
Compact cold shoe for thinner microphones
Extended cold shoe for fatter microphones like the Rhode mic shown in the photo
The other end of the base allows any tripod mountings to be added. The photo shows my rig, all of the parts are available here on Thingiverse. I'll add links in the comments later if I can find them all again!
3D Warhorse PLA