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Very easy to solve it... ...simply decrease Voxel Size parameter in Volume Builder object. (and for total perfect look apply Smooth layer)

I saw this interesting gizmo on YouTube, and thought I'd have a go at doing the cutout using R20 Volume Builder https://vimeo.com/288629613/708a352c47

i'm already rolling, although i might not be dead yet. on exhausting days like today i kinda feel like it though :D @Igor should be an easy fix, if you still have the vector file... if not just say it and i'll send it to you again. ;)

Thanks Igor. Version 2 has different camera angles If anyone's interested, to get the cut out I started with a plane and an approximate 3 point spline. I put 2 nulls at the ends of the rod and used XPresso ray collision to get the hit positions on the plane, then used that data and point node to set the spline points more accurately (plus structure and some math tweaking). I swapped out the plane for a cube, made a sweep on the spline, and stuck it all in volumes. Volumes seems to give nice smooth booles. R20 scene rod.c4d

This can be done using asset node materials in R20. You can store single nodes or complete materials in an own asset database and use these assets in any number of scenes.