PS making weak circles
The attached picture shows the model I'm trying to print. It's got a 1-line-thick wall and tabs on two sides that should be fully connected to the circle.
The problem I'm having is that PrusaSlicer (even the latest 2.9.0) produces gcode that does not make full circles and then fill in the tabs like I expect. Instead, it makes a half circle, skips over the tab part, makes the other half circle, and then fills in both tabs which just barely connect to the half circles. The connection points are extremely brittle doing it this way and usually break before the print is even finished printing.
Is there a way to coerce it into making a full circle rather than splitting it up? I would prefer not to make the wall thicker, but I will if that's the only option. The red/blue markings are seam enforcers (blue) and blockers (red), but that doesn't do anything, because it's technically not making seams.
Any suggestions would be appreciated.
RE: PS making weak circles
Not that I'm aware of. However without your part or ideally your project file to examine its going to be specific. There are many things you could try like switching to Classic slicing but its going to generally do islands first which means the enclosed tabs and then the circle, as it looks like your circular part is a single perimeter thick. This has always been a thing with single perimeter walls.
RE: PS making weak circles
that's what I was afraid of.
Okay, thanks for the reply. It's probably not worth digging into the gcode, but appreciate your willingness.
I will just make the perimeter bigger and make the internal part smaller.
As an experiment you could try slicing using a profile with a smaller nozzle (don't try to print it yet) so that two perimeters occupy the same space, examine the preview pane and see if the result is suitable; only then consider a nozzle change.
Cheerio,
RE: PS making weak circles
I don't know if it's worth messing with the CAD design of your part to achieve the perimeter you want, but I was able to get a continuous 1-perimeter circle by creating something like your shape in a part with 3 separate bodies, with the curves of the D-shaped pieces having the same radius as the inner wall of the cylinder.
I did this in FreeCAD, grouping the cylinder, the D, and its mirror all in a part (group) that I could export as a single .stl. Then in PrusaSlicer, I imported and told it to split that stl to its component objects. It leaves them in place, touching each other, but creating gcode for each individually and allowing your single-perimeter cylinder.
The attached UntitledCylinder.zip includes the Untitled-Part.3mf (PrusaSlicer 2.9) and Untitled.FCStd I used to create the .stl.
I wasn't able to figure out how to control the ordering of the parts... I could drag them around in the list, but it didn't seem to affect the gcode.