[coryrc]

Why do you think this is better than the old practice of filling straight holes a few layers deep?

[mgunlogson]

because the plastic has to displace air.

This method seals the nozzle against the tube and injects under pressure (theoretically). And leaves a path for air to escape. Pretty much a micro version of injection molding

[ricardobeat]

Is that available in any of the standard slicers?

[stirfish]

I think that's called z-pinning, and it might not be because of patents. I'm not sure though.