Looking for Klein Bottle model/dataset

Anyone know where I could find a accurate (as much as can be in 3 dimensions) model of a Klein bottle? I’d make my own, but every time I try it comes out rather ugly, and googling turns up no models or datasets, but plenty of stills/animations that all seem to have exactly the same model. This leads me to assume that there’s a specific shape these things have, not just a concept, and I would like to have something mathematically accurate. Thanks!

Images
http://www.btinternet.com/~yannaco/KleinBottle.png

Dataset:
http://belle.sci.fukuoka-u.ac.jp/attach/5B5B4D617468656D61746963612FB0F5BAFE5D5D_6B6C65696E626F74746C652E706E67

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Thanks, but…
what format is that? :-?