New 400x400x300 Printer

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Hi
Just finished building my new printer.
Its seams ok when testing and adjusting single axels, but when working all together it starts to fai some random motor,
I'm using a total of 8 nema motors:
4 on Z axel
2 on y axel
1 on x axel
1 for extruder
Heated bed uses 220v with a SSR
Extruder uses a separeted 12v power supy wtih a SSR

I'm using a 12V 20A power suply, but for the sinthoms it seams that i'm low on power.

Can i get your feedback?

well given that my 350mm heatpad will drawer 27 amps.
As you'v got a 400mm x 400 plate. I'd say yes, not enough power.

Also nema 17 moptors draw around 1.7 amps. So 8x1.7 is only 13.6
(reads post again) is the heat pad attached directly to the mains or via the main psu ?

Have a look at led lighting power supplies.
I got a 600watt 50 amp one for £15 :-)

Same units but much cheaper if they think you're fitting led lighting rather than building a 3d printer

Also... with 4 motors on the Z-Axis, how are you driving them? Most stepper motor driver chips can't even power a single motor at full power. With 4 of them the Z-Axis would be very weak if all powered by the same chip.

Quote:

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Originally Posted by Roxy

Also... with 4 motors on the Z-Axis, how are you driving them? Most stepper motor driver chips can't even power a single motor at full power. With 4 of them the Z-Axis would be very weak if all powered by the same chip.

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I have made a conected two DRV8825 to the normal zport on the board and another two to e3 port (made a a pin to pin conections)

Changed power supply with 50A, and it worked fine until Rumba stopped talking with pc

Finally it's done.

To duplicate the ports of z and y motor used DuoWeiSi expansion boards made simple Y cables to get enable, diretion, step and 5 volts from rumba, and seperate power suply for these motors.
https://pt.aliexpress.com/item/DuoWe...311.0.0.fTJhdZ
Attachment 11221Now waiting for Mk10 extruder parts to upgrade for dual extrusion.

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Here are link if you want to download Sketchup files:

https://3dwarehouse.sketchup.com/mod...r-400400-Vslot
Printer design

https://3dwarehouse.sketchup.com/mod...inter-extruder
Printer heads design