Hi, tam105.

First, you need to displace the air in the nozzle of the VOL-25 head before material will come out. This may take a minute or two, even at 2000 ppm, because of the gear reduction and the threading on the screw. Also, ensure that the 3/8" socket connector on the head is seated on the square area on the top of the material reservoir, and that the reservoir is mounted tightly enough that it doesn't spin in the head.

If the shaft (but not the entire tube) is spinning, but material is still not coming out, give me a call. The number is printed on the back of the printer, and on our website. http://hyrel3d.com

Davo