Hi drmarco, Thank you for looking at this. You are correct the normals are all pointing inwards. I have done a recalculate to outside and will try again. I am a bit concerned that there may be a very small hole in the top centre that didn't close during the 360 spin. To be checked out. Again thank y...

The FC file is some 17Mb.

Attached is the STL file from Blender.

Select the Mesh Design workbench.
Edit->Preferences.
Import-Export, select Mesh Formats tab, Export group box.

Set up a few Datum Planes at the correct place and angle.
Draw sketches of the apertures and pocket through the hollow hemisphere.
A polar pattern for each pocket.
Add in some guessing for hole shape and position.

I create a B-Spline model in Blender and exported as an STL. Excellent mesh and consistent triangle size at a given height.

Imported into FC and created a solid from the mesh, then a base feature. I tried to pocket the base but FC wasn't having it. More FC mysteries I have yet to learn.

Hi abasel, I am seeing the kind of blemish you are showing now. It seems you are using a B-Spline for the outline of your skittle like model. Revolving this does not produce a nice regular mesh as you would expect. Some of the triangles are quite large in some areas. I am using FC 19.21857 and the p...

Thanks chrisb, I will check that one out.

Use a mesh viewer program like Blender to examine your model. Maybe it is Cura that is creating the blemish. I use PrusaSlicer myself and it occasionally says my stl models are not manifold. Using Blender I can sometimes find the hole in the mesh and I can patch it up. If I can't find or easily fix ...

Try putting a gap in between the inside ledge and the outer wall skin. That way any shrinkage of the ledge will be isolated from the outer wall.

Also, use a higher resolution mesh for your models. Facets on a curved surface is not a good look.

Reynard

If all the models are simple then pick off all the dimensions and re-build using FC. If not, then convert to stl as you have done. I used progeCAD to do the dwg to stl conversion. Blender is your goto program for doing room designs but you are looking at a long learning curve to master that. For som...