I have been using the FYSETC S6 V1.2 3D printer board as my telescope controller for a few months.

Here are a few videos that demonstrate the board and what it can do:

FYSETC S6 version 1.2 basic setup, with only the RA and DEC axes connected, as well as a WeMos D1 Mini WiFi adapter. Demonstrated with the KStars planetarium.

Slewing at 4.0 degrees/second, and also demonstrates it connected to KStars, the web interface and the Android App, the latter two over WiFi.

Also, here is a demonstration of a GPS module and a passive heater on the S6.