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I got a roll of the "SainSmart Flexible TPU Filament" to try out. It has a lot of great properties. It doesn't require a heated bed, it's really strong and it's flexible. It almost prints with no problems. I was a little worried about the EZ Struder handling it but the reviews said it worked better than the NinjaFlex. That said, about 50% of the time, it'll fail after a couple hours into a print (on my Rostock Max v1). It'll get jammed up in the EZ Struder in-between the hobbed gear and the bowden tube. Any ideas on what I can change to stop it from jamming there?

You'll find several threads here on modifying the EZStruder. Basically, the black part is drilled out to allow the bowden tube to reach all the way up to the hobbed gear. End of the tube gets shaped to tuck right in between the gear and bearing, providing full support for the filament. It does require changing the stock brass PTC fitting for a different part that the tube can pass through.

Thanks. After looking at the various solutions, I flipped the output of the EZStruder to the 3mm filament size, drilling the plastic out to the diameter of a bowden tube and cut a small piece of the tubing to fit in-between the brass bowden connector and the hobbed gear. That has been jam free so far.