My setup: modded ender 3 with duet wifi, switched to hemera now and can't heat the hotend properly. In response to M303 H1 250: "Auto tune cancelled because target temperature was not reached" after ~5 minutes, peak temp at roughly 115° C. The part cooling fan is off (needs rework anyway, the supplied model would blow straight at the nozzle). The connections at the terminals seem fine. I fixed the beta value of the thermistor to 4267 as written in the datasheet. I am not aware of other changes related to the heater cartridge. I think the fan is blowing quite loud and much, but afaik, firmware controls the fan during PID auto tuning. An issue I just remembered, found during assembly: the heater block slightly touches the motor at the edge. I could not avoid this while keeping the connection somewhat intact. The manual and various other builds I've seen photos of were inconsistent, so I used the online form last week, but got no response. Maybe it looked like a stupid question, but now the hotend is dangling around. Just to test, I ran the auto tune again, and it (slowly) got to 180° C within 5 minutes (after which the auto tune is aborted automatically). What am I supposed to to? Maybe it's just the heatbreak not breaking... I don't have a reliable tool to measure temperature.
What do you mean by "the heater block slightly touches the motor at the edge". Can you post a picture of that? And what voltage is your machine and what voltage is your Hemera kit, especially the heater cartridge? Lastly, I'm using the following configuration with my Duet 2 Maestro for the Hemera's Semitec 104GT2 thermistor: M305 P1 T100000 B4725 C7.06e-8 Sources: https://forum.duet3d.com/topic/1104/thermistor-documenation-wrong-or/5 https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors
Welp. The first part was kinda stupid, I adjusted with the nozzle screw depth and now it's aligned in a 90° angle to the motor and cooling part. Regarding the voltages: I didn't measure it, but AFAIK the ender 3 and hemera use the same heater cartridges. I also heavily assume that the ender 3 is a 24V device (based on product description). If my hemera hotend was 12V (against the sticker on the packaging), it probably reached high temperatures way earlier than expected And WTF. While typing this, the hotend (screwed in correctly, so it actually has a better thermal transfer than my last half-screwed test) reached 210° C while tuning to 200. I don't get it, but maybe my notes help someone else. I could probably align it with the cables pointing to the axis again, if I unmounted it (heater block can't be turned in mounted state) and screwed the nozzle further in. But that is to be left for another day. I'll check your C-Value, haven't set that yet. Looks solved to me.
Glad to hear that you've solved the issue! But please note that if you're using that C-value, you need to use the B4725 value I quoted as well.
Yeah, did so. It's working fine now, printed test cube in PLA, PETG and now reprinting the backplane in PETG, before the current PLA suffers sudden death. The bl touch mount already cracked on one side and had to be glued before falling apart too early.
