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yep a basically a wanhao duplicater i3

also have a look at the monoprice mini. Smaller build volume, probably better for precision prints.

filaflex and ninjaflex are both pretty much identical in every test I've tried.

How large an object are you planning on making ?
Can't recommend a printer without knowing how large it needs to...

you need to find out the density of the filaments you're looking at.
For starters on the tpu: ninjaflex and filaflex are the most common.

As long as a 3d printed object is watertight - it will...