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im having a problem getting retetier to slice a part, but its telling me in my log, that the object is non-manifold. im curious what section of my part it is referencing? ive changed the part a few times now, it was previously talkin about there was a hole too close to an edge or something along with the non manifold aslo. so its no longer saying that, just the non manifold, sould I just gap the wall I moved previously a few more time? when u see the pic, I have a pulley there are 5 holes to mount the pulley and I designed support material into the bottom of the v groove bc I print it flat, and that is the wall that I have moved outward and thickened between the bottom of the groove and the top of the inside of the cut star pattern. it just seems I have something too tight in my dimensioning or something? thanks, otherwise this is making me very happy, its spit out many nice parts to get to this completed pulley (instead of gear) design

this is the file im trying to print...

What did you make the part in? it looks like sketch up to me, but I can't tell for sure. From my (very) limited work with sketch up, it seems to often leave gaps in the mesh of the objects you create because of flipped poly's and things like that (this is why its limited). I would recommend trying to use netfab with it to repair it. Netfab is free, you can just google it and it. Depending on how broken the mesh is, you should be able to repair it.

Non-manifold probably won't be fixed by netfabb for a part like this.

Did you make this in Sketch-up?

If you attach the file, not just a picture, I may be able to help you out.

In order for any slicer to know what to do with an object, it has to be a manifold, meaning that the geometry has to form a single layer of "skin" that completely and exactly separates the inside from the outside. It has to be airtight. It can have holes punched through it, like the handle on a coffee mug, but there can't be any holes into it, like if you jabbed a pin into a balloon. If there are any holes, the slicer won't be able to figure out the inside from the outside.

If there are any holes into the object, you'll get manifold errors. If there are extra layers of skin, faces and lines that are not a part of the skin but rather protruding inside or outside the object, two faces overlapping each other on the same plane, etc. you'll get other errors which might or might not matter. I've noticed KISSlicer likes to turn small geometry errors into spurious support material.

If you're using Sketchup, download the Solid Inspector plugin. It will let you inspect objects to see whether they're manifold, and it will highlight any trouble areas. Face Maker is another good plugin to fix broken geometry, although it requires some babysitting. Sketchup can be used for making 3D printed objects, but it really sucks for small objects due to unnecessary internal limits.

I use alibre as much as I hate to plug them, but I think It had to do with m "feature pattern" which was the support material I built in the groove, I take those supports fins and its ok, so ive found another way to modle my support without using the cirular feature pattern! thanks foor the info!

I would run it through netfabb regardless, certainly cannot hurt and you may be surprised at some of the corrections it can pull off.

Otherwise, my good friend's previous posts are pointing you towards help. Include the files and you'll likely get a mad dash of people who will be more than happy to help you correct them. I know I even immediately wanted a crack at it.

Very helpful and friendly community here!