That was really my point...
Personally, as I work with these types of processes every day with my work, I'd still be very wary of something that structural being made from 3D printing. It might work for less mechanically critical parts, or for short term testing, but not that gearbox in a long term robustness way anyway...as you found yourself!
3D printing will be great one day..and is improving all the time...but currently it is still really only a prototyping (or ornament making) process for most things...and that goes for the bigger industrial printing machines as well...not just the small desktop types.
Just understand the material and process before making promises to potential customers. CML might have got it wrong by not supporting the c4.1 any more, but you could also get it wrong promising people fully working gearboxes made that way
I look forward to being proved wrong though...it'd be a sign of 3D printing actually being that good already, and injection moulding companies needing to start worrying!