prusa and super are different forks of the same slic3r, afaik. They leapfrog over each other wrt features, etc. I have just tried it in cura, it slices perfectly, apparently. However, there are reasons for differences, the slicer simply going up through the model in 0.2mm increments, say. But, first layer heights can be different, so it will hit features at different layers/part layers, and settings can be made to vary layer heights throughout the print. There are numerous adjustments that can /need be made, depending on what needs to be printed, and material being used. Slicers have different strengths and weaknesses, and in this case, the object looks as if it will print better sliced in cura, cf superslicer, in my case, without changing any print parameters. But, fundamentally, the stl file is good enough. I'm fairly certain, that if the op tried a different slicer and/or settings, he'd get better prints. fwiw, I've just had an auto-update reminder for superslicer, and it goes to prusa slicer update, so I guess you've just had an update too. On 17/01/2021 13:37, adrianv wrote: I put the model as posted here in PrusaSlicer and the slicing looks fine, with no problems anywhere around the hole. Sounds like PrusaSlicer and superslicer should be pretty similar, so it seems strange that you get a different result. Here's how it slices with 0.2mm layer height: <http://forum.openscad.org/file/t2477/slice.png> mondo wrote > Never too old to learn - the last two evenings I've been getting an 86 > year old guy started in openscad - over the phone. That's fun for him, > juggling the phone, keyboard and trying to squint at the difference > 'twixt })]. Anyway, hopefully we can find a better font than the default. > > Now, your chopped off tube. I redid it, the way i would do it, and the > stl is fine. In the default slicer I use (superslicer) changing the > layer height, and the nozzle size, reduced the artefacts. Also tilt it > over so slant is more horizontal may help, but it'll then need supports. > > As Adrianv mentioned, the error is at the sharp edge, the bottom of the > hole at the slanting top face. Tilting the model changes the path of the > filament, but then you can get changes at the top outside edge, high > point of tube. > > Depending what the final purpose of the item is, then you could print it > with a few more solid top layers and sand it off. There are also a > number of different slicers, that may handle this differently, but as > you are an ex programmer, then you could edit the resulting G-code - it > is not that complicated, just a bit tedious. It  depends if the juice is > worth the squeeze. 😁 > > > > > On 16/01/2021 22:29, lleblanc wrote: >> Hi, >> >> Thanks to all for the many answers. >> >> I'm with version 2019.05 and quite new to OpenSCAD, but as a (retired, if >> one ever retires from that) programmer, I enjoy the code-like approach of >> this design tool. >> >> I didn't know about the F5/F6 commands, I always use the Render button, >> that >> corresponds to F6. >> >> My friend printed my STL and notes a small imperfection at the base of >> the >> bevel (photo) - perhaps starting the cube left of the cylinder would >> help, >> as was suggested. It was easier to start right at the cylinder edge since >> I >> readily know what the intercept height should be without further >> computation. >> >> Mirrycle.jpg &lt;http://forum.openscad.org/file/t3095/Mirrycle.jpg&gt; >> >> >> >> -- >> Sent from: http://forum.openscad.org/ >> >> _______________________________________________ >> OpenSCAD mailing list >> > Discuss@.openscad >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > Discuss@.openscad > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org