Summary

This is the barrel cooler i designed to keep cold my barrels....
For the printing should be better use petg for the frame, i did at 1.5 layer height, and pla for the other parts i did at 0.1 layer height..
The fan you should use is a 50x15mm 5volt turbo fan usually used in 3d printing...
1 switch like that:
https://www.amazon.it/gp/product/B06VW9YNQS/ref=ppx_yo_dt_b_asin_image_o06_s00?ie=UTF8&psc=1
and a 9volt battery i use a li ion rechargeable like this:
https://www.amazon.it/gp/product/B07GYJX3JN/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
to assemble the cooler you need only 2 4x25mm bolts
The pipes have the caliber mark and mount it outside....
The pipes are designed for my guns if someone need a different pipe i can design gladly..
The 308w perfeclty fit both ar-10 and 300winmag bolt action on the bipod....