Smooth Results from bwboundaries

Hello All,

I have seen others ask this question on the forum, but was unable to find the answer for my problem. I am using 'bwboundaries.m' to find contours on an image I import to Matlab. I then use the contours to write them to STL files.

However, the boundaries that are found using bwboundaries are very rough and jagged when zoomed in, which is not the ideal result. I need something smooth to work with. I have attached pictures of the issue and the code, would love some help.

Thanks