Basic fillet and 3d printing troubles

Hello everyone, it’s Vins and I’m a newbie with Rhino.
I attended a course about this software but sometimes things get hard, even tough they’re pretty basic.
I’m prototyping a wrench for a motorbike but I’m in trouble with a couple of things:
In the link I posted you can see the inner and outer rim of the wrench. For one half of its height, it should be sunken with different rims (hexagonal and circular); for the other half, it should be solid. The offset it’s a circle for all its height. On the top, a solid hexagonal prism.

  • As long as I need to 3D-print it, I’m trying to get a solid, filled object but I keep getting the same hollow result, even with different ways to model it (extrusions and multiple splitting or boolean intersection). Is there the chance to “fill” the volume in Rhino? Or the 3D printing software will ask me if I want to print just the surfaces or to print the surfaces and the volume inside?

  • I’m trying to make a fillet between the the lower edge of the hexagon and the cap of the circle. What’s the best way to do that? Image related: image

Thanks in advance,

the second link ask for permision to enter.
in the first image. it seems you can model it by lofting several sections with the Straight option enabled.

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Hello @DiegoKrause
thanks for your help. Lofting was one of the ways I was trying to modelling with; unfortunately it doesn’t “fill” the volume of the polysurface (if you try to split the wrench by using a plane, the sections are hollow; hope the 3D printing software will help me.
This link should work: image; I’d like to chamfer the edge between the surfaces of the exagon and the cap.


EDIT: as expected, the 3d printing software keeps printing just the surfaces and not their inner volume. How can I solve this?

can you upload the file to see what’s wrong with it? in the video the model I made is completely solid or watertight

There’s no such thing as “filling in” an object. If you close up all the openings so that Rhino says it’s a “closed solid” then it’s a “solid” and will print as one.

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Thank @DiegoKrause and @JimCarruthers.
There’s definitely a point I keep missing: I loft the outer rim, the inner rim, join them with caps but I keep getting a closed polysurface and not a solid object.
That’s my file; curves on the second layer.
Untitled.3dm (3.4 MB)
What about the chamfer between the upper cap and the hexagon edge?
Thanks a lot for your help,

are the same thing, If you are going to print it, go ahead, it will work.
there are several topics here arguing with the theory about solid objects and closed polysurfaces, for me are the same. if you export it as STEP and open it in SW or Spaceclaim or what ever, it will say it is a solid object.

Thanks @DiegoKrause,
My 3D printing software, Cura, let me choose the “infill” percentage: if I set it at 100%, it’s going to print the inner volume as well.

What about the chamfer between the edges? If I try to fillet the surfaces, this will happen: image
Thanks a lot for your help :smiley:

What’s to discuss? Every CAD and graphics 3D modeling technology except voxels defines a “solid” the same way–an enclosed volume. Mechanical CAD systems used to be called “solid modelers” because they simply never allowed the user to do anything that would leave the model “open.”

because the fillet you are trying to make, intersect the chamfer edge and explode. I think you need to make the fillet before the chamfer.

Is this what you are trying to accomplish? I did this by making the whole thing a closed polysurface using the hex curve to trim the upper surface of the truncated cone, joining and capping. Then simply executing the fillet command.

After fillet command this remains a closed polysurface.

how did you use the hex curve and get an octagon? haha
anyway in his case, the fillet and the chamfer are touching each other so I would recommend to apli a revolved cut after the fillet is apllied.