1. About
  2. Features
  3. Explore

I am currently building my own 3D printer, it is all set and ready to go but I seem to be having issues with the silicone heat bed I purchased. The motherboard I use is from the Flashforge Creator Pro for it allows me to use dual print heads.

The silicone heater bed I purchased has 3 leads with the capabilities to be run three phase which was something I did not ask for nor did I expect. Now I've noticed that when I plug it into my board, the board says that it is sending power to the bed but it doesn't seem to heat up. Also when I wire its thermistor, in it keeps reading around 110°C at initial startup and would not recognize room temperature.

One last thing, my power supply is a 24v rather than the standard 12v. I'm stuck because I have no idea how to resolve these issues. Do I need a different heat bed altogether or should I make it 3 phase and if I do how would I go about doing so? The pictures are too large so here are the links:

1 Answer 1

What you purchased is probably a bed that can be configured for either 110V or for 220V, depending on how you hook up the wires: the bed contains two heating elements, hooking these up in parallel gives you the 110V version, hooking them up in series gives you the 220V one.

If you attempt to use this bed with a 24V supply it won't work. The power dissipated by a heater is proportional to the voltage squared. Depending on which way you hook up this bed, you'd either get 1.2% of the designed power (220V mode hooked up to 24V), 4.8% (110V mode hooked up to 24V) or 2.4% (one half of the 110V circuit hooked up to 24V).

If my assumptions are correct (which you could verify using a multimeter to measure the resistance between the various pairs of wires), then the only way to use this bed is to connect it to mains power and use a (solid-state) relay to control it. However, please get advice from somebody experienced in working with mains electronics before doing this. Do not attempt this on your own.