Hello, I'm in the midst of buying parts for a CoreXY-style printer, and decided to go with the same print bed as what appears in the BigBox (purchased from Filastruder). My question is, the blog post for the bed describes using a 400W 24V power supply, but I'd like to know if a 360W supply is enough. Everything else on the printer will be 12V so only the bed will be using the 24V supply. Thanks! Andy
Using a recently calibrated Fluke 179 multimeter: After subtracting for the lead resistance of the multimeter, bed resistance at the crimped cable end is 2.1 ohms at 18C and 2.2 ohms at 30C. Resistance will continue to increase as a function of temperature, so the peak load on a power supply would be about 11 amps.
Much appreciation for the detailed answer, thanks! Maybe it is worth the extra money to go up to the 20A supply.
Is there a certain reason to choose 12V for the rest of the printer? I suggest you better use 24V for everything.
Originally when I started getting parts I went with one of the readily available & cheap RAMPS kits on ebay, which afaik can't do much past 12V. If I were to go all 24V I'd need something like a Taurino Power board and a 24V heating element for the hot end, right? Edit: Oh and fans, would need 24V fans. Why do you recommend all 24V power?
I was just curious why someone wants 24V for the bed and leaves the rest with 12V. As it's not so difficult to use a RAMPS with 24V, I will not give such a long answer myself, read here instead, there's an answer to almost every question: http://forums.reprap.org/read.php?219,196602