Allow me to introduce Project "Full Metal Delta"
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I got around this on my all metal delta with substantial insulation between the bed and the electronics compartment and two fans push-pull config. They come on if the heatbed is above 40 deg C. Probably 5 degrees mcu temp rise printing but that's probably processing causing it.
I do much the same, but I have only one fan. Ever since I set it to thermostatic control when the MCU temperature exceeds 45C or a motor driver signals a temperature warning, I have never heard it turn on. I have the motor currents set to 1A and the bed heater is AC mains voltage, so the Duet doesn't generate much heat at all.
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Yeah I might try that but I have a passively cooled psu in there too (just 120w) so I'd like to keep that cool, the first one I had in there died, this one has a 3d printed perforated cover.
I have to say if I built another delta (up to 1m tall or so) then I'd put everything on the top like the TevoLM its a nice way to do it, I did this for the cylinder framed delta I recently completed, very easy to work on the electronics. However you then end up with the machine on the floor (or a low table perhaps), so you don't have the print at eye level like you can if the electronics are under the bed. Much bigger than 1m and it might be impractical to put the electronics on top, as you're not lifting a machine that size down to change a wire and getting on a ladder to fix it isn't much fun. I've never actually moved my kossel XL since I built it.
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I do much the same, but I have only one fan. Ever since I set it to thermostatic control when the MCU temperature exceeds 45C or a motor driver signals a temperature warning, I have never heard it turn on. I have the motor currents set to 1A and the bed heater is AC mains voltage, so the Duet doesn't generate much heat at all.
Huh. Could you share a link to an example to use the MCU channel and/or driver sensors to do this? I cannot find such a resource?
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My electronics cooling fan is connected to the Fan2 output and set up with this line in config.g:
M106 P2 H100:101 T45:55 L0.3 ; electronics cooling fan
It means monitor virtual heaters 100 to 101 (change it to 100:101:102 if you have a DueX2 or DueX5), turn on the fan at 30% PWM if the highest monitored temperature reaches 45C, increasing linearly to 100% PWM at 55C and above.
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My electronics cooling fan is connected to the Fan2 output and set up with this line in config.g:
M106 P2 H100:101 T45:55 L0.3 ; electronics cooling fan
It means monitor virtual heaters 100 to 101 (change it to 100:101:102 if you have a DueX2 or DueX5), turn on the fan at 30% PWM if the highest monitored temperature reaches 45C, increasing linearly to 100% PWM at 55C and above.
Oh, marvellous
Now, My fan selector is set for 12V as my hotend / print cooler are npn PWM.
My ventilator fan is however a Noctua PWM expecting a 5V PWM. (Might be 12V tolerant, I do not know and do not want to test). Would it work to simply clamp a 4.7V Zener Diode on the FAN2 output to ground you think? Or is there a better method? Voltage divider?
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Nice looking build. Test the flying extruder carefully, I could never get it to work without it causing tilt / artifacts on my extruder's motion near the edges of the bed.
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My ventilator fan is however a Noctua PWM expecting a 5V PWM. (Might be 12V tolerant, I do not know and do not want to test). Would it work to simply clamp a 4.7V Zener Diode on the FAN2 output to ground you think? Or is there a better method? Voltage divider?
[EDITED]
If your fan is 5V only, connect it between the FAN- pin on your chose fan connector (black wire) and +5V (red wire). You can get +5V from the expansion connector, or from the 5V end of the fan voltage selector block (the pin that doesn't have the jumper on it).
If instead your fan is a 12V fan with an extra 5V PWM control wire (and probably also a tacho wire, but you can leave that unconnected), then connect the red and black wires to an always-on fan connector, and the PWM wire to the FAN- pin of a controlled fan output.
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Fantastic, very nice looking build. Good to see other folks going all metal.
You might also consider diagonal bracing, it is amazing how much it increases rigidity. Having said that, I have a much larger printer built in a similar fashion, and have not YET put bracing on… and I'm still getting excellent prints.
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And, I'm a huge believer in putting controller/power/motors at the TOP
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There's a good case to be made for electronics at the top and PSU at the bottom. It keeps all the mains voltage wiring out of the way when you are messing around with the electronics, and saves running mains voltage wires up to the top.
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There's a good case to be made for electronics at the top and PSU at the bottom. It keeps all the mains voltage wiring out of the way when you are messing around with the electronics, and saves running mains voltage wires up to the top.
Agreed, that is a nice balance.
And/or split the difference. I do have PSU on top on this particular printer, and therefore mains wiring… at the same time, this will have a heated bed, with the heater using mains wiring, and that will be via a SSR and separate mains plug, all at the bottom. So a little of each.
In any event, ALWAYS earth (ground for Yanks) the frame on an all-metal printer.
