6.5 Creedmoor/308 Win Chamber Chiller
thingiverse
This is my take on a chamber chiller for a 75mm x 30mm USB cooler fan I found on Amazon. (https://www.amazon.com/gp/product/B07Z7PVJH8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). It fits most 6.5 Creedmoor or .308 Win chambers to speed up cooling. The fan comes with screws, but they were rather long, so for this one I embedded M3x6mm threaded brass inserts into the bottom of the fan mounting holes and used an M3 screw to attach. Be sure to use higher temp filament as something like PLA could easily melt or deform in a warm rifle chamber.
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