Hi,
I'm the guy that was mentioned that made the T5M with 3d printed arms.
I saw you mention that you want a B5 waterfall that can use a fan. Here is a picture of the one I am using right now:
http://tinypic.com/r/2nbapns/8
I started making this because people were buying another 3d printed fan waterfall that would break. It uses O rings on the top to give a little chassis flex. The guys at the track seem to think thats an advantage.
I've got a version at Shapeways, but haven't received my copy, so I can't vouch for it's durability from first hand experience. In the past, Shapeways has been much more durable than my home printed parts, so I'm not too worried.
If you are interested, you can get it here:
https://www.shapeways.com/model/3004...html?li=aeTabs
If you have any questions at all, please let me know.
Thanks,
Erik