I have two Mini Kossel's that sorely needed a better extruder mechanism, fortunately the TITAN got released at just the right time. I ended up having to grind the embossed plastic down on the Titans front cover so my printed mounting plates fitted flush. Even so when I clamped the bolts down the gear started to bind, so back off each bolt half a turn and the whole assembly is happy, without the bolts being loose. The pair are now waiting time to calibrate both the Titan and the Kossel. I'll let you know when they are done.