Help with BooleanDifference

Rhino Rhino for Windows
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1

Hi forum,

I’m trying to create a simple mould but I’m currently stuck. I’ve tried using Boolean Difference, but I can’t get it to work.

Here’s what it looks like before and after. There must be something I’m missing.

Any ideas? I’ve attached the file below.

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File.3dm (479.9 KB)

2

the seam of your part is exactly coincident with the face of your cube.. This is a common failure point for booleans

extract the top surface and trim it manually.

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3

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image1704×1491 164 KB

any reason your initial surface is so complex - isn t it just a revolve ?

i built a new revolve and boolean difference works fine.

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image1704×1491 159 KB

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image1704×1491 150 KB

File-3_tp.3dm (1.1 MB)

also notice - if this should get a rigid mold - you’ll have some undercut:

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image1704×1491 139 KB

happy modelling - tom

4

Even better, lay of those boolean tools (there’s a good reason why there’s “boo” in boolean) that seem to cause problems again and again, and use Rhino’s tried and trusted NURBS surface modelling tools instead ; )

5

Ah okej that make sense! Thank you for the explanation kyle. :slight_smile:

6

I made it using a sweep, but I’ll try to remake it as a revolve. Thanks for the input, Tom!

7

Hahah, verkligen ett passande namn. Ska testa det! :smiley:

8

Det finns ett ‘Volvo’ i ‘Revolve’ – det rullar på bättre än Boolean! *

(* hopefully chat gpt did a good help with my first contact to your crazy language")