In Cura version 4.7 a bug regarding slowdowns in circular perimeters was introduced (or at list gets triggered much more easily than in earlier versions): https://github.com/Ultimaker/Cura/issues/8321 This issue makes v4.7.x hardly usable. Sticking to v4.5 has become quite "tricky" to say the least, due to the massive python-induced dependency hell and lots of dependencies being too new and/or incompatible for the 4.5 version. Version 4.8 has been released on November 10 that fixes this glitch in the simplification algorithm. The issue is still open, but is considered to be solved with 4.8 and changed default settings for Maximum resolution and Maximum Deviation. From the Changelog of 4.8: Fixed under-simplification (blobs, zits) on some printer models. An oversight in 4.6.x resulted in an oversimplification (smoothing) of models. The attempted fix in 4.7.x overcompensated, which gave difficulty (zits, blobs) for some printer models when the resulting gcode became too intricate. This is now fixed, though some profiles might need to be updated, since they where made against 4.6.x, and therefore may rely on the over-simplification. Would it be possible to fast-forward to 4.8?
A commit references this bug: Author: db Date: Fri Nov 20 23:03:25 UTC 2020 New revision: 555795 URL: https://svnweb.freebsd.org/changeset/ports/555795 Log: From PR: In Cura version 4.7 a bug regarding slowdowns in circular perimeters was introduced (or at list gets triggered much more easily than in earlier versions): https://github.com/Ultimaker/Cura/issues/8321 This issue makes v4.7.x hardly usable. Sticking to v4.5 has become quite "tricky" to say the least, due to the massive python-induced dependency hell and lots of dependencies being too new and/or incompatible for the 4.5 version. Version 4.8 has been released on November 10 that fixes this glitch in the simplification algorithm. The issue is still open, but is considered to be solved with 4.8 and changed default settings for Maximum resolution and Maximum Deviation. From the Changelog of 4.8: Fixed under-simplification (blobs, zits) on some printer models. An oversight in 4.6.x resulted in an oversimplification (smoothing) of models. The attempted fix in 4.7.x overcompensated, which gave difficulty (zits, blobs) for some printer models when the resulting gcode became too intricate. This is now fixed, though some profiles might need to be updated, since they where made against 4.6.x, and therefore may rely on the over-simplification. PR: ports/251236 Submitted by: Sebastian <sko@rostwald.de> Changes: head/cad/cura/Makefile head/cad/cura/distinfo