Hi Forum. I have the attached model of starboard spacer ( high-density polyethylene ) that historically I've crudely milled on my own that I'd like to have milled for me. Towards that end I modeled in Moi really unaware of what shops that do this kind of thing are looking for as file. I'm aware that with 3D printing there are programs that care of filling voids, add structure, etc. like UltiMaker Cura, but I'm at a complete loss for what a milling/plastic shop that does this work would like from me ? Any helpful resources on this ?

As for the specific model, the spacer has a groove for a couple wires that will be machined out of the bottom of it. To perform the boolean diff of wire groove on spacer I'd like to close off the triangle sections highlighted in magenta that are open ( see grouping "how to close off triangle section ?" ) before performing the boolean diff. I remember that planar on sections like this are problematic. But how else to realize and then create a solid of this grouping which can be diffed from the spacer ?

Sven

p.s. I appreciate when people create posts with animated gifs showing what they are looking for or before and after. Is there a post that explains how to do this ?