Skywatcher 66ED cell. ZWO guider on one of my home-made bitsa guidescopes.
The cooler is an online design that uses a copper plate slipped between the sensor and the next circuit board. I 3D printed a cover to help insulate it and support the peltier, heatsink and fan. Quite tricky to get right as you have to make a heater from resistance wire to go around the sensor to stop condensation and get the right balance of cooling and warming! Camerea also has the IR/UV filters stripped out. Made a huge difference, but then I got a big cooled mono ZWO and a filter wheel.
Sadly, not got up to much since 2021. I think this one is with the ED66. After this, I'd better shut up and let the thread get back to speaker cabs!