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,