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Thanks! So I've tried a different computer and on that one also managed to get c5 to slice okay. What I'm experiencing looking at the UI/progress bar and the logs at the same time is that everything is going smoothly — until those errors start occurring. When they do, it looks like it takes 1-2 minutes to slice each layer. And with several hundred slices that's... a problem. What does that error indicate? (I"m also curious why when I switched machines at least one of the two problem files didn't occur again!)

Hi, everyone. I'm trying to print a big multi-part model - https://www.thingiverse.com/thing:351271/files Of the 22 individual parts, 20 of them slice just fine. (And I've successfully printed 3 of them). But 2 of the parts hang while they try to slice. (The C5 & C6 blocks if you want to try downloading them from Thingiverse yourself.) The settings I'm using are the default Ultimaker3 settings, with a AA 0.4 print head using generic PLA. I'm using the Extra-fine 0.6mm settings with 20% infill, and haven't done anything fancy anywhere else. Thanks to earlier posts in these forums I've made sure I'm on the most recent software (4.4.0 on MacOS), and also checked the logs and this is what I see: 2019-12-03 23:42:56,979 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 49, 1 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:43:02,686 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 50, 1 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:43:54,339 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 52, 2 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:47:13,470 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 53, 9 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:50:47,475 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 54, 9 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:55:22,702 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 55, 9 level 1 insets remaining to be output (should be 0!) 2019-12-03 23:58:06,535 - DEBUG - [Thread-13] UM.Backend.Backend._backendLog [101]: [Backend] [WARNING] Layer 56, 28 level 1 insets remaining to be output (should be 0!) I would appreciate any help in understanding what this means and what I can/should think about or do to help solve this. Thank you sincerely for any help!