[Is there a filament strong enough to work for high torque gears?]

Maybe you can try PEEK or PEI (Ultem), see our website 3d4makers.com

Regards

Ardy

[weiches Material (Nylon, PCL) und UM2]

Makerbot does not sell PCL i think, at least not if you are talking about PolyCaproLactone

[Polycaprolactone (PCL)]

It s no problem to print with PCL, we do it with an ultimaker with good results. If you want to order PCL filament you can check out 3d4makers.com