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I used an old server ATX power supply, which was around 1000W, although a 500W supply would have been fine.
Only the 12V output was used
The max current draw is the sum of the following:

  • 4 x z-axis Nema23's at 4A total
  • 2 x y-axis Nema23's at 4A total
  • 1 x x-axis Nema23 at 2A total
  • 1 x extruder Nema17 at 1.5A total
  • 2 x volcano hotend heaters at 6A total
  • several 12V fans, approx 2A total

Which comes to around 19.5A peak at 12V