Pellet Extruder - Prototype

THIS IS A PROTOTYPE/CONCEPT. I HAVE NOT PRINTED THIS.
I DO NOT VALIDATE THAT THIS WORKS, YET :).

I made this design to promote a new concept of "open source" pellet extruder. I designed this with easy commercial items to reduce costs. If you know about other material that would better the design, please share :).
DOWNLOAD LINK ORIGINAL FILE:
https://a360.co/2OD2y9w

PLEASE READ:
This design uses this pulley and this 14 mm. screw.
https://www.amazon.com/2GT-Timing-Belt-Pulley-Closed-loop/dp/B01M2DL73S/ref=pd_nav_hcs_rp_2?_encoding=UTF8&pd_rd_i=B01M2DL73S&pd_rd_r=83f7433a-a3f9-44ec-b325-b3c74a326126&pd_rd_w=84bjE&pd_rd_wg=v5Hn2&pf_rd_i=nav-high-confidence-slot&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=1f389e35-a4a8-4fe9-bcb3-352102c5df87&pf_rd_r=BE4EK2RR5EHH35M4T72S&pf_rd_s=nav-high-confidence-slot&pf_rd_t=40701&psc=1&refRID=BE4EK2RR5EHH35M4T72S
http://bit.ly/2RYx1g3

I was planning to print the barrel on Shapeways, its approx $170.00 USD. which is actually not very expensive for a ful