Dust Collection Blast Gates

Copyright (c) 2020 Michael Graff

I've installed a duct collection system in my home shop, and needed to get several
blast gates for each tool, so I can get the maximum air flow on the tool in use.
I use three common duct sizes: 6 inch, 4 inch, and 2.5 inch. I've created a
gate assembly for each.

While these are built for my use case, I am happy to create any inner / outer
diameter as needed for others, as well as spacers. Please contact me if you
have suggestions for common metric dimensions.

Printing:
* I use 0.3mm or 0.2mm layer height
* 2 perimeters, more if desired.
* I use PETG, but PLA should also be fine.
* No supports needed.

Parts needed:
* 3/16th inch thick plywood. Other sizes could be used by adjusting these
spacer height. One dimension should be cut to fit in the gate slot, and
approximately 3 inches wider than twice the hole size.
Example: 6 inch gate needs about a 15 inch length to open and close.
* 4mm x 12mm hex