Topic: Thermistor Question
I will be using an Azteeg X3 board which comes with a setup for a second hotend
can that thermistor be used to monitor enclosure temp.
Also what would be the ideal enclosure temp.
Ultimaker S3.
1 2013-11-16 21:11:37 (edited by dubbsd 2013-11-16 23:47:27)
- dubbsd
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Re: Thermistor Question
dubbsd wrote:
I will be using an Azteeg X3 board which comes with a setup for a second hotend
can that thermistor be used to monitor enclosure temp.
Yes. Any of the later Marlins include this specifically (using a ambient sensor or enclosure sensor). See my latest github.
dubbsd wrote:
Also what would be the ideal enclosure temp.
How longs a piece of string is the correct answer 
55-75°.. but you'll read of the usual outliers who swear you want to run it at the surface of the sun, and others that are firmly of the opinion that it needs to be 'slightly' above ambient.
If going for the scientific approach (as opposed to the anecdotal ) of wanting to *slowly* bring a printed part down to ambient without cracking/warping etc.. Somewhere around the 60-70 mark would be fine. Keep in mind though at those temps, your steppers will be operating close to their design-limits, and you'll most certainly want to ensure the electronics are not house inside the enclosure.
- dubbsd
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Re: Thermistor Question
thanks for the info
Ultimaker S3.
Re: Thermistor Question
I'm keeping mine around 37C and it seems to be doing great so far. 55-75C is extreme! If the machine was all metal i would not have a problem, but cycling ABS over and over again at those temperatures you are sure to have some warpage over time that may be adjusted out.
5 2013-11-17 02:13:30 (edited by adrian 2013-11-17 02:41:49)
Re: Thermistor Question
Hey I did start my post by saying I was making the statements from the scientific basis with which one heats their build chamber rather than throwing numbers at a wall and seeing what stuck *shrug*
For reference, and I guess industry supporting evidence, if you haven't ever do have a read of the patent on heated build chambers in relation to FDM... which quotes even higher numbers.
http://www.google.com/patents/US6722872
Thats one of the many sources from which I derived my advice.
Note, the contents of a Stratsys are indeed substantially more metal than an SD - but aren't all metal. Theres plenty of injection molded ABS. I also suggest you are overestimating/thinking the thermal impact at the temperatures I referenced in relation to ABS.
But hey - like I said - I'm just using the lead from the industry (as per the patent for example and practical examples in the field) and the scientific basis of why a heated chamber works/helps/is needed so it is probably very much open to backshed reinterpretation *shrug*.
For reference, the most specifically relevant advice from the Patent, which still exceeds my advice, is:
USPatent-6722872 wrote:
The preferred temperature of the build chamber is in a range between the material's solidification temperature and its creep relaxation temperature (creep relaxation temperature is defined as the point at which the stress relaxation modulus has dropped by a factor of ten from its low temperature limit). In the case of ABS thermoplastic, the temperature window falls between approximately 70° C. and 90° C.