A simple joiner that allows you to connect two ends of a length of 6mm wide GT2 timing belt. The joiner is shaped so it does not interfere with the teeth of the belt.
Print with largest surface down.
Slip the ends of the timing belt into the slots to create whatever length continuous belt you need. You can trim the excess belt, or leave as is if you need to adjust later.
This was designed to be used with my OAT Focuser:
https://www.prusaprinters.org/prints/150513-openastrotracker-focuser
but it could be used for anything that needs a loop of GT2.
The author hasn't provided the model origin yet.