My Form Cure won’t heat anymore, it just goes straight to curing, zero re-heating and even after an hour of running the camber is just above ambient.
This morning I took it apart to see if there was anything obvious, I was suspecting the thermistor to be broken as it seams to think it’s already up to temperature when it starts.
Taking it apart was no problems, everything was pretty tidy, all leds on circuit board and the thermistor completely separat., though no markings as it’s casted into a ring terminal.
I measured it to about 12k ohm at around 22c decreasing to 11k after holding it for a bit.
Tried to look up 12k ohm thermistors and found what appeared to be a very similar unit, but I didn’t find any resistance/temp table to check it against.
As seen in a picture one wire was squished in two places, not sure if that would affect too much but the unit has worked for more than a year before it failed.
I’ve already been in contact with support that have confirmed there is no support or spare parts, I have to purchase a new unit at full price.
Could someone (maybe for Formlabs) confirm if my sensor reading are correct or if the thermistor seams broken?
when you first start the cycle, does in show any temperature readings on the screen?
Maybe 12k is already too low so it thinks it’s at or above temp. Since it went to 11k when you touched it, you may can try something greated in kΩ for testing. (In case 12k corresponds to 60oC+)
Or maybe try to cool it down to raise the kΩ
I’m sure the support knows the temp graphs needed, not publicly sharing is another thing…
Thanks for reaching out about this - I’m sorry to hear about the heating issue you encountered with your Form Cure. In terms of troubleshooting, this is out of scope for what we’d be able to offer. As you mentioned from your discussion with Support, we do not have replacements available for the internal electronics of the Cure, and we don’t have the information you’re seeking about the thermistor offhand. I recognize that this may not be ideal, and I appreciate your understanding in the matter.
I really appreciate that! Given you confirmed my ambient reading it would almost seam unlikely my thermistor is broken.
That for sure made this more difficult, if not impossible to resolve with my electronics experience.
I just wanted to follow up here and briefly add on to my previous reply. In terms of troubleshooting specifically for electrical components, it can be difficult for us to diagnose issues properly, especially through remote troubleshooting. For this reason, we shift to device replacement rather than troubleshooting for electrical issues. Thanks again for your understanding with this.
I understand that @Jesse_K and I also understand that my units was out of warranty with a few months when it happened so I wasn’t expecting much help from the support. But as already pointed out this is clearly not a user induced problem, but a hardware fault so it would have been nice if Formlabs would at least have offered a discount code for a new unit.
Though I still think it’s so wasteful to throw away a mostly functional machine because of a minor electronic issue that most likely can be resolved by changing a component or the main pcb.
Anyhow, @agiorgitis I took some more measurements to compare with your and they seam to match up pretty well. Right now I have the unit sitting out in clod storage (10c) and will get a reading from there too.
But for now, here are todays readings from the thermistor, heater and heating fan.
It’s for sure a fan running, I’ll verify which one later today.
I’ve looked over the pcb twice, once with my iPhone in macro mode but nothing stod out, everything looks ok. But I’m not an electrical engineer so I might have missed something.
Well I’ve obviously missed something as it’s still not working.