Enclosure heater on Duet 3
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@jens55 - I'm sorry if this wasted your time. To be honest, the printers we are using to build our new prototypes are not of the same design - they are older DIY that we are rapidly trying to replace with our new designs (and aren't talking about much).. but threads like this add confusion. My apologies. You are right that with the steppers inside the enclosure, our new design should not be heated to 80ºc.
About the fan under the build plate - I did understand and like the idea.. my thought was that since the thermostat is basically built into the build plate heater, it won't get above ~100ºc. The Stego we are currently using has a max surface temperature of 200ºc.
We are working on building our first purpose built enclosure for our new design as we speak. I'll be doing similar tests after it is complete and report back.
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Not at all a waste of time. I have been wanting to test this for some time but kept stalling on it. This discussion gave me the extra incentive to set up the test ... so thank you!
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I do use this type of heater - https://szxinruite.en.made-in-china.com/product/vykEjoYlrwhx/China-Rhw-032-Industrial-PTC-Fan-Heater-for-Electric-Cabinet-with-UL-Thermostat-Heater-Temperature-Control-Heater.html
At first, I've been using a 300W version which gives me 55C in 15 minutes with a heated bed set to 75. Now I do have installed 800W + 300W and together they are reaching 70C in 15 mins without a heated bed.
However, during heating, they turn off then the surface area of the radiator reaching specific temp. I am planning to mount the fan directly on the wall and make a-holes in the sidewall to suck cold air from outside and heat it through the radiator. Which I hope will keep the them on for a longer period and will heat even faster.
https://forum.duet3d.com/topic/13873/wip-corexy-with-heated-chamber/67?_=1598174589336
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Digging up this older thread to report in.. we've recently tested multiple chamber heaters and have settled on a target temp of 70c for our enclosures. What we've picked as our recommendation is the Stego 028119-01. It is a 250w PTC with built in fan. Along with the build plate at 110c, it can heat our chamber to 70c in less than 30 minutes.
First, here is a photo of our enclosure:
And the Stego heater:
And the PanelDue after the chamber temperature has stabilized:
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Boy that machine is looking sweet! Well done!
