The OpenAstroGuider is a printable 50/183mm guide scope with a integrated IMX290 sensor that can be mounted to OAT directly, or be adapted to mini-Vixen clamps.
It can be used for Guiding OAT, OAM or any other mount with ASCOM support.
It does not support an ST4 interface, so you can not use it with star trackers like the Star Adventurer without a special USB-to-ST4 adapter.
There are currently two designs you can choose from:
This is the official guider design. You can find the CAD and STL on GitHub
Assembly Instructions are here.
This is the improved guider design. The improvements were mainly over v1 of the official guider. Nowadays both are very similar.
You can find the corresponding thingiverse page here.