I think kmanstudios have it explained, there are other issues as well. Slight over extrusion cause buildup of material here and there. When object structure changes, the slicer could decide that another direction of the nozzle is better and it will meet the excess material. Also the effect of cooling and curling are emphasized by the gradual cooling of material. When the nozzle then pushes on the now slightly expanded material, the build plate tends to be pushed down a slightly bit while the nozzle lays the material. But when the nozzle moves when not printing, the build plate are back up and combined with expanded material sooner or later the force holding the object down will give in.
kmanstudios 1,120
I think kmanstudios have it explained, there are other issues as well. Slight over extrusion cause buildup of material here and there. When object structure changes, the slicer could decide that another direction of the nozzle is better and it will meet the excess material. Also the effect of cooling and curling are emphasized by the gradual cooling of material. When the nozzle then pushes on the now slightly expanded material, the build plate tends to be pushed down a slightly bit while the nozzle lays the material. But when the nozzle moves when not printing, the build plate are back up and combined with expanded material sooner or later the force holding the object down will give in.
I had not considered any over-extrusion. The layers look nice and even, no shortage or gaps, or blobs. Ooze shield is doing its job quite well. Not stringy at all.
But as a follow up, I did close the doors last night and my new print does not have the effect. And, what tipped me off was this was a short model started as the day was closing and cooling. Usually, it only happened after a long time and considerable height. Rats! Was enjoying the cooler fresh air, especially after having everything closed up for a little more than a week printing with PC...it got hot in here! I do have bubble wrap taped over the opening to keep in the heat, but a lot must be getting out the top.
Our weather is really all over the map too. Not even getting to 60°F here in NYC today. A lot of humidity, but only a PLA on PLA print.
But, equalizing the temp did help. No bumping or knocking into parts.
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kmanstudios 1,120
Could this be the reason? I noticed that the night is cooling and it is starting to make rubbing noises and even pushing the plate a bit. Again, I do not have really good climate control and our days are heating up, but our nights are cooler.
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