Just curious here. I had a print stop due to AMS feeding issues. I finally got it fixed and re-started the print. But, it was stopped for 8 1/2 hours. I’m letting it finish because it was 46% in to a 50 hour print, but I’m curious if there is an extremely high likelihood of layer adhesion issues where it was stopped for so long.
Well, there is an increased likelyhood. I did have such failures but none recently.
Instead, I did recently have good prints that had night long pauses. An 8 hour pause just over the weekend, so
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The plastic shrinks as it cools. You don’t generally notice (provided you don’t get warping) because a new layer is printed before the layer below as cooled off a huge amount. But if you have a long pause and especially if the build chamber temperature drops, shrinkage will likely result in a visible “discontinuity”, a small offset in the walls printed after resuming, relative to the walls below. The previously printed part will be slightly smaller. For a thin wall, the shrinkage could result in the print failing.
And yeah, a hot layer laid down on one that’s cooled off won’t be as strong as a hot layer laid down on one that is still hot.
A low-warping material like PLA or PETG adulterated with whatever will shrink less. Matte filament – along with glow in the dark, wood and carbon fibre – tend to shrink the least due to the large amount of not-plastic in the mix.
ABS is pretty much ruined if it stops for more than a couple minutes due to its tendency to warp.
Thanks for the responses. Here’s to hoping it turns out ok. I was so far in that I wanted to give it a shot. Should be finished in about 10 hours from now. Later yesterday I ended up having my prime tower come loose from the build plate and move with the nozzle. I glued it back to the build plate and was pleasantly surprised that ended up working out. LOL
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It really depends on the environment, as someone already mentioned. If the chamber temperature varies drastically, it may not last long before you start noticing a pause in print quality. I’ve had PLA Basic paused for over 48 hours before I was able to remove the issue and let it finish. The print turned out flawless, but this might not have worked with ASA, PAHT-CF, or other high-temperature filaments.