I think your root problem here is caused by the script font itself. A lot of fonts that have sharp intersections like that on the "e" use multiple points stacked on top of each other with one bezier handle apiece, instead of using a single corner point with two bezier handles. (it's a common problem caused by the tools they use to speed up the creation multiple font weights). When you extrude the surfaces made by stacked points you often end up with little walls pushed in random directions. As far as Cheetah is concerned, these are tiny little walls, not a single corner point.
Are you using the font tool in Cheetah, or importing outlines from a drawing problem like Illustrator or Affinity Designer? if importing, cleaning up those corners in 2D is often simpler than welding the points back together in Cheetah.
Also, be very careful about the extrusions of your letters overlapping the letter next to them - look at the left side of the "e"- in a 3D render, this is rarely a problem, but in 3D printing, you would be putting a single wall surface inside of a solid 3D objects again.