I was printing and congratulating myself on how well everything was working and then suddenly the printer started printing what it was supposed to print in the wrong place. I've heard this described before by the gurus on youtube as some kind of shift and I have experienced it before but I would just like to know what causes it. To me it seems like a gcode glitch.
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If anyone can explain to me why this happens.
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I had this happen exactly once. It was after a power fluctuation. The printer tried to resume the printer, but the X and Y coordinates were off, so it got it wrong. I don't think it's really a gcode glitch as much as a failure of the printer to rehome the axes before trying to resume to print. Of course, there is the possibility that trying to home the Z axis could cause the hotend to bang into the print, but I can't think of a reason why at least the X and Y couldn't be homed.
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It depends on the accuracy of the homing. Usually the micro switches used to home are good enough, but the distance is not the same all the time. This changes the offset slightly on every home and for all axis.
If the power went out, the print head oozes plastic for a few seconds to release the pressure and the print head is usually glued to the print during the process. If that connection is strong, then you cause it to pull on the model, when the head is rising to home. More important it can leave a plastic gunk ball and when the printer returns can bump into it.
I never trusted these print recovery functions. At least on my glass beds they are no uses, as once the print bed gets lower 50°C the print gets loose and resuming will cause a failed print with wasting even more plastic. In three years I had a power outtake during printing once. It was just a two hour print, so not a big deal, but instead of adding a resume feature, I would rather buy new batteries for a PSU sitting for ages in my printer cabinet.
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To help preserve spare batteries, get yourself a trickle charger and cycle through your spare batteries, changing to a different battery each month. You need 1 trickle charger for about every 6 batteries, because gel cell batteries will keep their charge quite well for 6 months. A good brand of trickle charger is Battery Tender.
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The answer to power outages is a UPS. I use this one: https://www.amazon.ca/CyberPower-CP1...xpY2s9dHJ1ZQ==
Please note: since you're in Canada, I went to amazon.ca 😁
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I would agree with you now but not in the last 19 years I've lived in this apartment that I inherited from my son. He and his wife lived here two years before me and our friend lived here before them. So it has been in the family for many years. I have never had such internet interuption in years as I do now nearly daily. I have no idea why.
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Hydro Quebec is a really big company and it sells a lot of electricity to the USA. We should have free electricity in my view. But it has been very good at maintaining service. Quebec is 3 times greater than France. I had a transformer blow out in front of my place and we were something like 12 hours without electricity at =20C. But they came and changed the transformer while I watched them and wondered what I would do if they all screwed off home. But they did it. In my mind these guys are heros.
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