Hi,
I’m new to rhino and I’m trying to make a connector part for some square tubes for 3D printing and I have a pyramid like shape that I need to add thickness to, I tried OffsetSurface but because I need the thickness to be added on the inside it creates a lot of overlapping surfaces which I’m not sure how to fix, could someone please help to suggest a fix for this
Thank you!
You might want to upload a file. Difficult to work from a jpeg.
Hi! Just uploaded the file.
what’s the plan with that though 
looks neeto, but maybe trim it? 
the plan was to get rid of the overlapping surfaces so i could 3D print the shape, I tried Boolean intersection and boolean split and boolean difference but it didn’t work. I also tried just working on one section of the model (3 triangle surfaces) but that also didn’t work. On another post, someone said to offset the bottom and then extrude to point but someone else pointed out that it would result in a model with a thinner, variable thickness wall 
. So I’m not sure what to do
Here’s a quick solution.
thank you for the help, how did you get just the curve structure from the beginning of the video? I copied the curves from my model, but then it doesn’t loft the same way it does in the video, there are curve points at the end of the lines which i can’t delete, so even when I try to select just the angles lines on top (not the base) it doesn’t let me do that with just doing a selection box I have to select each curve one by one.
Oops forgot to upload the file, will do when I’m back in the office tomorrow. I made them using the silhouette of the base of your design and connected the corners to a single point at the top then lofted.
I spent just 1 minute working on it, but I fixed the toe area above, see if it suits you
30mmsquaretubeFORUM_mod01.3dm (1.0 MB)
This is reminding me of another thread where someone was having a similar problem due to non-manifold geometry.
There’s other examples too, but this is what this geometry reminded me of:
Looks like that’s also some of your geometry, so maybe there’s another technique that will achieve the goal better.
This here is definitely an issue:
Is this design intended to intersect at one point?
Untrimming helped a bit:
I’m seeing weird render mesh behavior I don’t think I’ve really ever seen before, at least not like this, it’s dynamically moving around (per each zoom change interation), in and inverse sense…
at nano scale o’ course bbl 
thanks for all of the help, I don’t know if I’m missing something really obvious but I tried lofting the silhouette and it just does this every time, and only gives me the straight sections option
I’m not sure what you mean by this, I checked the properties in my file and the numbers are different
thanks for the help, how did you mange to do it?
@Polina1 I used this command:
I think you’re referring to my recommended settings based on some of the first things I would adjust about the situation, as I’m perceiving it at the time.
Another issue I noticed are the non-manifold geometries that seem to be a pattern.
It could be design intent, but would have to be a special reason for it.
Thanks so much for all the help! This method worked!
