PCB heated print bed
thingiverse
A PCB heated bed is the focus of my project for almost two months, inspired by http://www.neufeld.newton.ks.us/electronics/?p=864. The latest test at 110W showed flawless performance, reaching 108°C within minutes. Now, I'm working on a great mounting solution for version four (V4) of this project. With a heated area of 22x20cm, you can choose between 1.3ohms (110W at 12V) or 21ohms resistance. A plain kapton tape is all that's needed on top, eliminating the need for steel or aluminum. I am currently testing a 21ohms setup with a 55V PSU, providing 144W and approximately 110-120°C. Soon, I will test with a 12V supply and provide an update. To etch the design onto a FR4 35um copper board, the cost should be around $20. If interested, feel free to email me, and I might be able to etch some for you. Note that tinning or copper plating is not necessary as it increases resistance. The final resistance depends on how you connect the four resistors on the board using solder bridges – parallel configuration results in 1.3ohms, while a serial setup gives 21ohms.
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