Anycubic Linear Plus External Blower Air Jet

This is a simple rig to implement a precisely focused air jet at the tip of the hot end by using an external blower. It works very well, but it is very noisy and only a little better than the much simpler modification of the duct on the standard ANYCUBIC blower: [ANYCUBIC Kossel Delta Filament Cooler (Fan Duct)](https://www.thingiverse.com/make:639606). The external blower air jet mount is shown on the left in the cover photo, the improved duct for the standard blower is on the right. The main d