INVERT OBJECTS

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INVERT OBJECTS

Postby scdrawert » Mon Dec 17, 2018 8:24 pm

Dear Community,

my plan is to create items in SketchUp which i want to product from modelling concrete. In order to do that i need the "negative" of this item and send it to a 3D printer.

i.e. i want to make a cylinder -> i need to get a cube with a cylindric hole inside - clear i guess.

My question - is there an easy way to generate NEGATIVES or INVERT my objects in Sketchup? becuase some of the items simply get too muss to translate them in my head into the respective negative form.

Maybe someone can help me with a hint or a plugin?

Cheers guys
hans :|
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Re: INVERT OBJECTS

Postby pilou » Mon Dec 17, 2018 11:19 pm

As you have the Pro version, seems that you can make that you want with the "Booleans" functions! ;)



even better for pro or not Pro

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Re: INVERT OBJECTS

Postby pilou » Tue Dec 18, 2018 2:35 am

Something like this! :)

GIF_boolean_keep.gif


free to you to Union the 2 boxes at the end if needing... :ugeek:
As alas (in SketchUp) you can't use boolean function with a volume completly inside another one
you must uses 2 "boxes" from the start! :ugeek:
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Re: INVERT OBJECTS

Postby gilles » Tue Dec 18, 2018 8:54 am

A simple way ...


outershell.gif
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Re: INVERT OBJECTS

Postby pilou » Tue Dec 18, 2018 10:36 am

Hyper super tricky! :thumb: ...and free! :mrgreen:

Incidently I rediscover how easy and powerful to nest something! :ugeek:

GIF_nesting.gif
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Re: INVERT OBJECTS

Postby scdrawert » Tue Dec 18, 2018 5:51 pm

UH - thanx guys - these are a lot of options - sorry for asking noob questions.
I will try and hopefully one of these options will do the job.

have a great day and thanx for the support
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Re: INVERT OBJECTS

Postby pbacot » Mon Apr 08, 2019 9:20 am

Are you asking for a half mold? Anyway if you have a solid and a you put it in a larger cube... Reverse the faces and you have a "negative object". But perhaps you want half molds--which it seems are needed to print. Then you can put a plane down the middle of the object and the cube and intersect faces. Depending on your shape this can be simple or it can require more planning and knowledge.

For printing the shape has to be solid and a clean, solid original shape should lend itself to being a mold. I'm just saying it shouldn't be a trick or require special tools. The shape is the mold itself, you just have to show where the mold material is around it.
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