Don, I just wanted to thank you again for the parts list and for answering my questions. I just finished adding a DIY cooler to my new ASI294MC, and I think it turned out great. I haven’t tested it fully yet, but in my initial test it dropped ten degrees Celsius and was still dropping when I shut it down to finalize the wiring and take some pictures of it, which I’ll post once I can resize them.
I hope to try it out tonight before the moon comes up.
I basically copied what you did, except I think I mounted the controller a bit different - one half of the case from an old SD card, some electrical tape and some high temp open-cell foam made a nice backplate and stand-off for it - and coincidentally, the mounting holes for the controller lined up nicely with the wider fins on the heatsink. I used two of the original fan screws to mount the controller to one side of the heatsink.
I’ll mainly be using it with a XT8g Newtonian, but I may try experimenting with my 102 SLT achromatic too.
With your info and help it was an easy build, and it seems to work quite well - thanks again!