When I did this extrusion I had it vertical to try to help it feed better, but I think vertical makes the diameter shrink more doesn't it?

Here is the video of me breaking the part I printed (ignore the dirty hand, I have a perpetual state of grease, wood dust, and paint whenever I'm in the garage) - it was really strong along the wall, with a weak spot at the corners that I was able to bend back and forth to eventually break, the middle of the walls though was not wanting to come apart at all:
https://www.youtube.com/watch?v=163Y3sH7ZEs

Here is the picture of the Filastruder in a vertical setup thanks to this http://www.thingiverse.com/thing:1508688:

Here's the raw PET pellets:

And here is the filament that is part ABS and part PET, the ABS was purple, the PET brown:

I extruded the mix at 220-230C, at 220-225C it wanted to stall, at 230C it seemed to shrink to a smaller diameter the longer it ran - so I had to move it back down to 220C and let it extrude a bit until it stalled again.  Frankly - I'm amazed I was able to actually print with it - but I was really glad when it stuck to the bed at only 50C, and then the part ended up being pretty strong (printed at 230C)

I need to go back and do it again in a more controller manner and see if I can find a ratio that works best.  I need to weigh it too so I can know for sure the percentage rather than eyeballing it.

PA747 is my personal favorite, but it takes longer to extrude and a tad higher temperature than MG94. also, vertical extrusion is awesome, but many people report better experimentation with 45°. When blending colors and materials, your experience may vary. I'm sure Elmoret could clarify/trump  these claims

At 230C it results in the stall protection kicking in at 1.61A.  At 235C it comes out almost like a liquid and breaks under it's own weight.  It comes out as a blob, and as it falls it stretches and breaks, and then another blob starts at the nozzle.    I dried it much more than I do ABS (few days in a dehydrator, few days in a vacuum desiccator, and finally about 5 hours at 300F in a convection oven) without improvement.  I finally got some extrusion by mixing it with ABS at a ratio of 75% PA-747 and 25% PET - but haven't used it yet (the diameter might have fluctuated too much to be usable at 1.4mm to 1.8mm, probably because the temperature had to be much higher than normal for PA-747 in order to melt the PET)

I'm wondering if it isn't the size of the pellets causing an issue - has anybody had extrusion issues with smaller pellets?  I'm going to try changing orientation, see if it performs differently in horizontal/vertical/45 degree.  Has anybody here tried PET themselves?