Fix orientation of the grain of some parts

[MisterTFM]

Is it possible to select certain parts that need their horizontal direction to be maintained?

IE: Certain sewing patterns want the grain of some parts to run in the same direction.

[scavenx]

If you're still looking for this feature, I ended up building a separate open source nesting tool that supports per-part grain constraints: https://github.com/RU-Airborne/BalsaNest

It was originally built for balsa laser cutting, but it addresses the same orientation constraint described here.