Probably My Fault, Why Can't I Split this?

Split Fail.3dm (65.3 KB)

Split Failed with either surface or curve No intersections? Tried MakeUniform, did not work.

Yeah… kind of your fault! =)

The file tolerance is .1 - that is very large. For items this scale, use at most .01 and preferably .001.
see

https://wiki.mcneel.com/rhino/faqtolerances

-Pascal

Thank you. Like I said probably my fault!