Thin edge print order
I am printing on a Prusa MK4S with Prusalicer 2.9.4. In general the print is OK except at the thin edges on the left side. The root cause appears to be that the slicer is laying down those 2 edges first instead of incorporating them into the rest of the outer parameters. This creates a seam and a weak point. Is there a way to get the slicer to treat that edge differently?
This tapering-edge issue comes up from time to time. In most cases the root cause is that the slicer is asked to do something mathematically impossible..
Try it yourself with a pencil and paper: Draw a shape with a tapering point - but draw it in a single line without lifting the pencil and without going over a previous line - any point narrower than two lines wide cannot be drawn without lifting the pencil and restarting.
PrusaSlicer solves the problem by running round the body of the shape then going back and adding the single line extension later. The Arachne perimeter generator does as slightly neater job of fine points than the Classic one 'though they're often fragile but neither can break mathematical law.
The true answer is to incorporate the limitation in the design CAD. The default minimal extrusion width of a 0.4mm nozzle is 0.45mm - so any section or point finer than 0.85mm will oblige the slicer to go to a single line anything finer than 0.45mm is likely to fail.
Yes, there are ways to nudge these limits a little but the underlying logic is unsurmountable.
Cheerio,
RE: Thin edge print order
Thank you for the reply. My main concern is that is makes the thin ends first, instead of last. For the first layers this is bad due to the potential for not sticking. Looks like the short ends could be incorporated in into one of the main strokes.