Max hot end heater current
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80W is silly? I am testing custom 100W heaters with custom CNCed chrome plated elongated copper hotend. Hopefully board will do the job lol. Will report back if I fry it! lol
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80W is silly? …................
Yes! The Diamond hot end has 5 heat sinks all taking heat away but when I finally managed to tame the heat creep issues, I ended up with a huge 60mm, 30+ cfm fan blowing cool air over those 5 heat sinks and that was with a 40 Watt heater https://somei3deas.wordpress.com/2017/10/23/the-diamond-5-colour-part-3-finally-tamed/
The diamond also has 5 melt chambers but a single 40 watt heater is more than capable of supplying enough heat to melt filament fast enough to be able to print at over 300mm/sec https://somei3deas.wordpress.com/2018/01/15/an-attempt-to-investigate-pressure-in-the-extrusion-system-with-a-diamond-hot-end/ and https://somei3deas.wordpress.com/2017/06/22/exploration-of-print-speeds-with-a-diamond-hot-end/
I've read somewhere that the heat requirement to melt filament is in the region of single digit watts. The above tests would tend to back up that theory, so more watts won't help. (but larger or multiple melt zones will).
As mentioned above, when the 80Watt heater was tuned, it showed a potential to reach 670 deg C - a 100 watt will be even worse so not only is it silly, but also a potential fire risk and downright dangerous IMO.
In practice, trying to use the 80 Watt heater was very difficult due to overshoot issues. The PWM is trying to produce single digit watts from a heater that is about 10 times too powerful.
