My "vintage" 3d printer needed a heated bed. Here is a detailed description of the process I went through to build a heated bed from scratch.

I didn't figure this all out on my own. Included are the links to all the various You Tube channels I relied upon to get this done.

The video I used as a starting point was posted by wtam69:
   • Separate hotbed heating controls for ...  

I learned to modify a digital thermostat watching a video by CNC Modeler:
   • DIY 3D Printer 240v 500w Heated Bed &...  

The ins and outs of surface mount resistors were revealed by Curious Inventor:
   • Surface Mount Soldering 101  


Here is a list of the components that went into making the heated bed:

Borosilicate Glass
https://www.amazon.com/220x220x3mmBo...

12Vdc 30amp Power Supply
https://www.amazon.com/SHNITPWRSwitc...

_12V Silicone Heating Pad
https://www.amazon.com/Signswise200x...

Digital Thermostat
https://www.amazon.com/dp/B08219B8W3/...