Fog Machine "Mole-Pipe" Chiller Duct

This is a simple duct for the well-known 10 cm (4") "Mole-Pipe" fog machine chiller system.

I'm certainly not the first to use this fog machine chilling trick, but I've created this duct to help keep the fog low-lying, and to make the pipe a bit more stealthy. I put my frozen water bottles at the exit end, so the duct also hides the bottles from view.

You'll need a 3D printer, some black filament of your choice, 2 empty plastic beverage bottles, and a length of 4" (10 cm) diameter flexible "Mole-Pipe".

First thing you'll need to do is print the duct itself. I used black PLA, but you can use whatever you prefer. PLA works fine as the duct is placed on the exit end of the pipe, thus far away from the hot fog nozzle.

The simplest way to print the duct is with the opening of the collar oriented flat to the build plate. The loft of the duct is shallow enough that supports are not needed. I included 2 tabs with holes so that the duct can be staked to the ground, or used as mounting holes.

While your duct is printing, fill 2 empty water bottles and pop them in the freezer.

Once your duct is printed and your bottles are frozen, you're ready to get fogging. Some people that use this fog chiller method put the ice bottles on the fog machine end of the hose. I tend to put mine at the exit end of the hose. The duct also hides the bottles, which is another benefit.

Slide the bottles into the end of the pipe and snap the duct on.

Set up your fog machine at the other end, and you've now got a fog chiller.