Nylon print fails when print region gets much smaller
I'm printing Taulman 645 nylon in a pattern that consists of a large outer ring and a smaller inner post. At a certain height, the outer ring ends and is no longer printed. At that point, the printing of the inner posts becomes terrible. I'm guessing this is a result of excessive heat. I had the fan turned off for the whole print, as recommended for nylon, but am thinking I should turn it on at this point. Is excessive heat likely the problem (see image), or something else? If heat is the problem, is there a better way to turn on the fan in Prusa Slicer other than specifying the number of layers?
The .3mf attached is a modified version which printed successfully; the .jpg is an image of the failed print.
Although you can specify a delay time for cooling of small print areas the simplest method is to print a second object on the same bed so that the hot-end moves away between every layer allowing better cooling.
Cheerio,
RE: Nylon print fails when print region gets much smaller
Thanks, I forgot about that possibility. It's a bit of a waste of filament, but in this case if I print two objects that would serve the same purpose.
RE: Nylon print fails when print region gets much smaller
It is worth to mention, that if you print two models at once, the layer adhesion drops. I would recommend to leave the fan turned off (a small breeze on nylon will cause poor layer adhesion) and just print it nice and slow. Or just slow it down on small perimeters.
1x Prusa Mini
3x Modded MK3.5 "HT" (450C nozzle temp)
RE: Nylon print fails when print region gets much smaller
It is worth to mention, that if you print two models at once, the layer adhesion drops. I would recommend to leave the fan turned off (a small breeze on nylon will cause poor layer adhesion) and just print it nice and slow. Or just slow it down on small perimeters.
I don't understand how printing two models at once would cause layer adhesion to drop. If the model is small, the time spent on the second model is less than the time spent on a single larger model, so by the time you're back to the starting point the larger single model will be cooler than the two smaller ones. The original problem was the layer was too hot, and needed additional cooling time so it wouldn't deform when the new layer is printed on it.