AC Bed SSR Box

I designed and printed this AC Bed SSR box. I have 3 printers converted to use AC power using this box for a much faster warm-up time on my 300mm sized beds. Many 3D printers rely on low cost Power Supply Units with limited lifetime at the top of their power rating. Switching to AC power for your heating bed greatly reduces the demands on your PSU and will likely greatly increase its life expectancy.

You will need the following items to complete your own:
- SSR
- Silicon AC heat pad
- AC inlet with rocker switch
- 40x40mm fan
- 4x M4 screws for the lid
- 2x M4 to fix the SSR to the heatsink
- 2x M4 or M5 to fix the heatsink to the bottom of the box
- 4x M3 screws for the cooling an
- Wire of sufficient gauge
- Soldering iron and screw drivers

The SSR sends the AC current direct from your wall outlet to the heated pad. It is controlled on and off by a small DC current, coming from your existing heated bed port on your 3D printer.

The common 40x40mm fan is made to dr