Wow - that's really Interesting. Cause, the last project I was doing at Essentium was a new purging & wiping system - that actually incorporated a metal V-shape - which sounds Very similar. Yikes - it would be crazy if the person implementing the V-shape for wiping actually saw it from an Essentium machine - or, even more so - someone from Essentium was involved with implementing this thing. But, I doubt that. And, the V-shape just simply makes sense!
And - I agree - someone should easily be able to determine a Jamming problems - like - it's a heating issue - or, cooling issue like heat creep. Without seeing the actual design - no way to truly know...
-K