Problem with Octagon Mesh

Hi, I have a problem with this mesh that I wanted to Negate and I got a little cheeky message

And I got a little bit annoyed but i am wondering now how can I make an octagon without using meshes.

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It states only blocks, spheres, cylinders, wedges, and corner-wedges are only supported, what did you use to make the octagon?

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I used Blender to make it but this message appeared but how do I create an Octagon that is allowed to Negate

You would probably just have to build it yourself with individual parts

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Really? what a bummer well thanks

It might also be possible to just do it all in blender and then export the mesh to Roblox

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I am not really advanced in blender but it might work

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You cannot make a Union out of meshes.

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Using the edge rotation feature (hotkeys c followed by r) with F3X you can create an octagon using 8 parts and edge rotating them at 45˚ increments.

If you have a 2x2x2 part, move it along the x axis 2 studs and edge rotate the outside edge closest to the last part by 45˚. Repeat until you have an octagon.

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At the moment you cannot union meshes, try making the octagon with parts from Roblox studio if you want to create a octagon.

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