General Question: what makes this better then the good old Archimedes screw?,(reply>), @Roman Nasuti Ok that's cool. Thanks!,(reply>), Yoav Zack lower dust generation: no matter the operating conditions or design parameters, it's always full flow. <br><br>It's also relatively low on friction and crush forces, all of which culminates in very low dust generation. It can also be braced, lubricated, and driven trivially at any point along the length.