The next part for the animatronic tail:

This parts clips in the plate - no glue required.

I tried to summarize some of the things I learned about 3d-printing in this video:

This is so great that you shared your expertise and explained your journey there.  I was surprised that so many nylon types did not work but glad you found reliable one. Your skull was much more flexible than I imagined and that tail is so awesome. I love that you made little parts to make it better. Thank you for taking the time to share with us!

Wow it looks like 3d printing is an art form all it's own!  While I doubt I'll ever do any 3d printing I watched the video and it looks like some really good tips!  Thanks for sharing and giving back to the community!

I was surprised that so many nylon types did not work but glad you found reliable one. Your skull was much more flexible than I imagined and that tail is so awesome.

The filament that caused the problems was PLA, not Nylon. The skull is made of Nylon - the PLA-prints are rigid.

Test-video of the animatronic tail:

I see angry cat in those motions.  Looks great!

That is very cool movement! Great job!

Wow great movement on that mech! Very smooth and fluid.

I sometimes could use a third hand when I glue the foam for a puppet body - I made this clamp to make my life easier:

The holes in the front are for needles.

http://www.thingiverse.com/thing:713095