2-Channel telescope dew heater enclosure

thingiverse

I'm adding miniature voltage and amperage readouts soon, just ordered them now, and will include them in a newer build here. In total, there will be three readouts: one for each channel's output and the input channel. They should arrive sometime next week as the meters won't come until November 1st. This is an enclosure I designed for making my own dew heater for my telescope. It has two channels with two RCA outputs on each channel and one input RCA jack, which you can use whatever battery suits your needs. I opted for a separate battery unit for easy swapping of batteries on the road. Find a suitable battery, find an enclosure for it or make one, solder up an RCA connector, and you're done. I ran the positive through the center pin of the RCA jack and ground is through the outer side, but as long as you wire all your jacks the same, it makes no difference. The PWM modules I used were rated up to 12V and 40A, and I'll provide the links below. The miscellaneous hardware was picked up from Home Depot along with the magnets. The rest was ordered online through eBay for pretty cheap. I used an assortment of M3 Nylon standoffs so the second PWM controller cleared the heatsinks of the first. Print settings are pretty forgiving as I designed the box to be printed on its sides, meaning minimal supports. The only supports that need to be printed are for the back plate and the screw holes; the rest is flat, so the external side of the box is nice and shiny with minimal or zero sanding required. The last part is a bit custom if you want: take a PWM controller and mount it in the bottom of the case. You can use some epoxy or superglue and glue the standoffs in to cut or sand off later for a cleaner finish. I opted to just use nylon nuts because I'm not feeling motivated. As usual, I've provided all the SKP files for easy editing if you need to change something up.