Hi
I have made this voronoi cylinder from a grasshopper tutorial. I want to add thickness normal to each surface, to make it 3D-printable. When extruding, the surface will “wedge” apart, as their normal direction is not the same. The tutorial I saw suggested “Weaverbird” - unfortunately this not work for Rhino 6.
CylinderScattered.gh (8.1 KB)
Can you try scaling it?
The other mesh editing components are from PhylloMachine.
CylinderScattered.gh (22.5 KB)
Is it important for your design to follow this method?
by looking at it it seems that it would be far simpler to create the voronoi surface on a planar surface, extrude it and then use surface morph to morph it on a cylindrical surface.
(you can make sure there will be no seam by using identical points on the two sides of the original surface and cut what’s left)
I believe this is what Aris is referring too:
The difference is that here you conserve the circular nature of cylinder with the Voronoi.
But I find the meeting of the geometry to be disturbing. (you can notice in it in the picture attached). I do not know how this could be solved for now.
This is what I’m talking about.
(if you repeat the points left and right and then trim, you will have a ‘seamless’ pattern.)
unfortunatelly, I am a little buffled with the intersections. Differences (for me at least) have always been a difficult part.
The final extrusion is not a clean shape and thus the final morph looks good but is not a good solid.
Maybe one of you guys can help with this part?
(@Joseph_Oster, I’ve kept it ‘telepathy-free’ in case you want to have a look at it) 
cylinder.gh (25.0 KB)
It was so easy???
edit: (I see now the cells are not prismatic, but you can intersect with the surface and extrude)
Here are two related approaches - NEITHER of which require any booleaning, so should be significantly faster.
This one builds on your existing approach:
CylinderScattered-2.gh (12.7 KB)
And this one skips the need for the 3d voronoi. You can successfully solve this and maintain tiling
with a 2d voronoi, as others have pointed out.
Voronoi Cylinder.gh (16.1 KB)
Thank you guys for some really good inputs and suggestions! I appreciate the solutions and alternative approaches to my little project here.
I have now used Joseph_Osters simple solution to make a model for printing - will post a pic if it turns out well.
My next steps is to try to make the shape more organic by filleting the edges, and eventually see if I can make some alternating structural thicknesses. I will be happy to hear your suggestions in this regard.
Another approach for these “Organic Cell” type shapes, is to look at manipulating/utilizing mesh edges. There are two plugins that open up some really interesting form explorations: (three actually…)
Weaverbird, (almost a requirement if you are doing any work with meshes…IMHO).
CytoSkeleton : Cytoskeleton - Grasshopper
Kangaroo, (one or two): In addition to the physics simulation, (which is not being utilized in this example), there are some very handy mesh editing/cleanup utilities. In this case, it’s just remove duplicate lines
There is some great discussion and examples on the old GH forum for using CytoSkeleton. Exoskeleton is another one.
Attribution: It would be remiss to not acknowledge Nervous system, whom brought this form into fashion back in 2009. Cell Cycle: 3d-printable jewelry design app inspired by microscopic cellular structures
Plugins required for example file:
CytoSkeleton
Weaverbird
Kangaroo (version 1…or 2, I just used the remove duplicate lines component).
Example file created with Rhino 6/GH 1.0.0005
KNERVOUSKNOCKOFF3.gh (22.4 KB)
Here’s a different/simpler approach that might be helpful for you.
CylinderScattered-bb1.gh (26.0 KB)
I’ve printed a lot of things like this. You have to be careful about the horizontal parts since there is no support for them. It’s a good idea to do a bridge test with your printer so you know how far it can span without drooping or messing up.
HI all,
i was playing around with something like that, the mesh version.
It fails at some points, maybe someone knows why?
