Duet wifi and electronics at 40-50° - 3d printer enclosure

Marco_76

Dear duet community,

I started to print with ABS with my COREXYU printer and I have the classical warping issues. The print is sticking to the heated bed (which is at 110°) but the print is deformed in the sides. I've seen approaches to fix (rafts, ...) but I'm planning an enclose.

So here the questions:

I've seen fully closed boxes which make sense to me but I'm worried for the electronic (duet and power supply). looking around I understood that 40-50 degrees should be ok to minimize the problem but... isn't an issue to have the duet and the power supply at these temperatures?
Alternatively I'm thinking to keep the bottom 15 cm open, where most of my electronic is (duet + power supply at least, while the steppers and end stop sensord unfortunately are in the top part). Imagine a box with the bottom open and positioned at 15 cm from ground. The heating should go anyway up and by saturating the chamber shold keep worm only the printing area, while the bottom would remain fresh. Is this a bed idea?

thanks,
Marco

mrehorstdmd

@Marco_76 Heat and electronics are always a bad combo. The lifetime of electronics is (roughly) inversely proportional to temperature. It's best to keep electronics out of the heated chamber. I don't think it's a good idea to leave the bottom of the box open- the lower end of your larger prints (which are a bigger problem for warping and delamination) may get exposed to low temperature too soon.

I print a lot of ABS and find that 50C in the chamber prevents delamination and warping. The chamber volume is about 420 liters and takes about 20 minutes to get up to 50C with a dedicated 500W heater plus heat from the bed. Don't take large prints out of the machine too soon. Let them return to room temperature slowly. My printer has a massive aluminum bed and moderate insulation of the chamber walls. It takes about 45 minutes for the temperature to drop, once all the heaters are off. My larger prints run for 30-40 hours so I'm in no rush to get them out of the machine.

The electronics are mounted on top of my printer, out of the chamber, close to the XY motors and the extruder carriage. That helps keep most of the cables short and allows access to the electronics even when the printer is running. There's a 5" 220V fan operating at 117VAC circulating air through the electronics housing. It turns slowly and is almost inaudible but moves enough air to keep things cool inside the electronics box.

roiki11

You have to remember that the 50C is not the electronics temperature but the ambient. The electronics themselves heat up so with elevated ambient their temperarure rises accordingly. If the electionics are at 50C at 25C ambient, they'll reach 75C at 50C ambient.

The same applies to motors and any device that generates heat. Best is to keep the electronics out of the enclosure.

pipersw

I have used the Duet in a 45 degres, and I have overheat warning on the TMC.
At 48 degres, the TMC shutdown, but the board was horizontal without ventilation.
So it could be ok if the board is cooled with fan on TMC and mosfet of the heatbed.

For the PSU, I have inside the enclosure a passive 500W 24V psu, but the dissipative face is cooled by watercooling, so the psu is at 30 degres.