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As I want to print with multiple colors I plan to upgrade my Ender 3 with the diamond hotend.

So far I found all information I need, except what power supply I need for my RUMBA board.

Can I use the default Ender 3 power supply or do I need an additional power supply or wires?

Parts I am going to order:

  • 1x Lite6 Heatsink
  • 3x Diamond Universal mount
  • 1x 12 V 40 W 6 mm x 20 mm Cartridge Heater Reprap For 3D Printer
  • 1x Thermistor 100K 1 % NTC Temperature Sensor Line for 3D Printer
  • 1x Fan 50x50x15 mm 12 V 125 mA
  • 1x Diamond Hotend Insulator
  • 1x Nema17 stepper motor 48 mm 1.8° 42BYGHW804 1.2 A 5.5 kg•cm
  • 3x MK8/9 Dual Extruder Feed Device Part For 3D Printer 1.75 mm Filament
  • 3x Bowden tube 1 m with fitting 4/2 mm (for 1.75 mm filament)
  • 1x RUMBA 3D printer controller board
  • 6x StepStick DRV8825 Stepper Motor Driver
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  • $\begingroup$ Ender 3 is a 24v printer so you have to address the heater and fans at minimum. $\endgroup$
    – swordfish45
    Commented Apr 20, 2020 at 20:29

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The RUMBA boards run up to 36 V, so reusing the (24 V) power supply from your printer should be fine. As the 2 extra steppers do not take much extra power (note you are ordering only 1!), your supply should be sufficient. Note that a 12 V heater cartridge is not going to work on a 24 V board (you'll get a massive overshoot and probably over-temperature warnings and printer shutdowns).

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  • $\begingroup$ Thanks! Your answer really helped me. I changed the 12 V heater cartridge to 24 V and added two extra stepper motors. $\endgroup$
    – user20891
    Commented Apr 20, 2020 at 23:00
  • $\begingroup$ @Janik In total you need 3 stepper motors, you could salvage 1 from the current extruder,so that you need to order 2 not 3. But, I would also order 3 to have 3 the same. $\endgroup$
    – 0scar ♦
    Commented Apr 21, 2020 at 10:36

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