|
The T0 sensor is the thermistor at the hotend of my 3D printer. Usually that means that the thermistor is shorted out (0 resistance) or one of the wires has broken (infinite resistance). The problem is that the error only occurs now and then in the middle of a print. After a reset everything is ok again, but the print is ruined.
Most probably it's just a broken contact or wire that sometimes fails as the printing head moves around. That's a real pain to track down and I don't want to randomly replace parts and cables until it's ok again. Any ideas?
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
|
|
|
|
|
|
Will a sledgehammer do?
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
|
|
|
|
|
I suggest waving a dead chicken over it and chanting.
Real programmers use butterflies
|
|
|
|
|
Something like that is only the last resort. In such a case I usually wear some feathers on the head and dance around the printer with two rattles. It can take a few hours of dancing and chanting and my poor neighbors might not get much sleep.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
modified 26-Oct-20 19:14pm.
|
|
|
|
|
Could you print the wonky part?
I’ve given up trying to be calm. However, I am open to feeling slightly less agitated.
|
|
|
|
|
I would not waste much time with a 3D printer if I had Jean Luc's replicator. 
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
|
|
|
|
|
Easiest to check is the wires - put a multimeter on "bleep" and check the continuity of each wire while waggling the about through the "normal" range of movement. If it stops bleeping, it's a wire. If it doesn't, it's more likely to be the thermistor, and that may only fail when it gets hot, which is a PITA to test ...
Do you have a spare hotend you can swap over? If it's not the wires and the new hotend shows the same problems, it's on the motherboard that monitors the thermistor.
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
|
|
|
|
|
Not a PITA: Put soldering iron (big) on head and monitor head temperature. My printer display updates every 5 secs or so.
Mircea
|
|
|
|
|
OriginalGriff wrote: Easiest to check is the wires - put a multimeter on "bleep" and check the continuity of each wire while waggling the about through the "normal" range of movement.
The problem may be thermal as well. A cracked trace on a circuit board or a sloppy solder connection can behave like that at different temperatures while looking just fine optically and seem to ok when you measure at room temperature.
OriginalGriff wrote: Do you have a spare hotend you can swap over? If it's not the wires and the new hotend shows the same problems, it's on the motherboard that monitors the thermistor.
Unfortunately not. I guess it's time to take the cover off the hotend and see if I can find anything obvious.
I have lived with several Zen masters - all of them were cats.
His last invention was an evil Lasagna. It didn't kill anyone, and it actually tasted pretty good.
|
|
|
|
|
First I would find out if it really is a thermistor, or if it might be a thermocouple or an rtd.
If it's an rtd or a thermistor you just need to put a voltmeter (or rather a logger) in parallell at the main board, and check how the value differs when it fails.
In theory that's all you need to do also with a thermocouple, but they are notoriously sensitive to such interference
Wrong is evil and must be defeated. - Jeff Ello
Never stop dreaming - Freddie Kruger
|
|
|
|
|
Mine would be Accelerated C++ by Andrew Koenig and Barbara Moo.
It's mercifully short, and it teaches C++ the Right Way(TM) - the way Bjarne intended it to be used, and how it works best.
It's suitable for beginners to C++ and in fact I recommend it for teaching C++, and it's the only one I'll recommend for that.
Real programmers use butterflies
|
|
|
|
|
A well-known compiler text has a dragon on the front. This one should have had a cow, branded with Euler's diagram of the 5 bridges of Königsberg.
|
|
|
|
|
So, the problem is that it's missing two bridges?
|
|
|
|
|
|
The dragon book is in the running for me but minus points because it could have been written to be far more accessible.
Real programmers use butterflies
|
|
|
|
|
My copy is the original edition from the mid '70s. I noticed it had undergone revisions, but it sounds like it's still somewhat inaccessible.
|
|
|
|
|
Yeah, it's not for mortals. I ended up working with another book to figure out most of it. What's funny is there was only pseudocode in the book and no math symbology. But also that was one of its strengths.
The book is Parsing Techniques: A Practical Guide[^]
Real programmers use butterflies
|
|
|
|
|
Too many CS types are wannabe mathematicians when they should be wannabe software "engineers". 
It's basically the same in economics, though the "should be" side is harder to describe. But I digress.
|
|
|
|
|
I'll run with your digression. =) As far as economics I've seen some interesting work in describing and modeling economies as Complex Adaptive Systems. There have been some books on it but also freely available works like this: http://williamwhite.ca/wp-content/uploads/2018/04/CAEGChapterpdf.pdf[^]
I think it shows more promise than traditional economics (not that it's all garbage or anything)
Real programmers use butterflies
|
|
|
|
|
A remarkably sensible paper considering that he worked in central banking and is a Canadian! But I'd just get rid of central banks entirely, or at least restore them to their original purpose, which was simply to provide liquidity in exchange for good collateral when it had few bids during a market panic. All this "monetary policy" stuff, including fixing interest rates and quantitative easing, is destructive, not to mention immoral.
|
|
|
|
|
I have this book too..
diligent hands rule....
|
|
|
|
|
K&R from decades gone by.
“If only you could see what I’ve seen with your eyes”
|
|
|
|
|
That was a great book. Short and concise. You could get up and running in C in no time.
|
|
|
|
|
I was thinking about that just the other day. "Code" by Charles Petzold.
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
