Sep. 5th, 2011

More power

Sep. 5th, 2011 09:32 am
johnridley: (reprap)
I ordered two new power supplies for the 3D printer. The heated print bed is basically a big 1.2 ohm resistor. At 12 volts it draws 10 amps and so only puts out 120 watts, which isn't enough to get it up to the desired 110*C. The recommendation of the group is to run it at 24 volts at 15 amps or 360 watts; the guys that have switched to that power supply can hit 110 degrees in under 2 minutes.

I also went ahead and got a separate 12v/12a power supply of the same form factor so that I can just put them both in a box and not screw around with this hokey trying to use an ATX power supply for something it wasn't designed for.

While shopping for 24 volt power supplies it was apparent that there are a lot of people toying with CNC at home. And it's surprising how cheap really hefty power supplies are these days.
G+ comments after the cut )
johnridley: (reprap)
I put the power supply they shipped with my 3D printer into my computer - the one out of the computer is able to make the printer work and the computer doesn't need as much power.

The one they shipped is kind of a hunk of junk. It's probably the cheapest ATX supply they could find that theoretically met the specs. But...
Their supply: the fan is noisy as hell, and despite being rated "500 watts" can't hold temperature on the printer bed
My supply: absolutely silent fan, rated 430 watts and brings everything up to temperature as much as possible and holds it there.

FWIW this is a Corsair 430 PSU. I have bought two of them now and they're cheap ($45 I think) and awesome - it has a 28 amp 12 volt rail.

The Corsair is going back into my computer and this junky thing into the spare parts bin as soon as those new power supplies for the printer get here, which should be by end of week (shipping from NY tomorrow).
G+ comments after the cut )
johnridley: (reprap)
I installed the printed knee joint replacement in the dome tent this afternoon and it works perfectly. I uploaded it as my first object to Thingiverse.com
Dome tent knee joint replacement by jridley - Thingiverse

G+ comments after the cut )

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