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Create a rough surface

Hi all, maybe this is an odd question because everyone wants to have a smooth surface, but I want to add a rough surface to a rather simple object.

In my case I have a twisted tri-face (extruded triangle) that comes like nearly all objects with a smooth surface.
Now I want to 3D print it with a rough sandpaper-like surface. Please see image below. 

Is this even possible with Tinkercad???

Thanks for any help!

Best regards, Jan

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