CPAP Silencer with switching valve

You can choose if you want cold air for maximum cooling performance while printing your sub 60 second benchy or if you want it a little more cozy for filaments that don't like it too cold. reduces noise levels significantly, doesn't reduce air flow by much, if at all. measured by my fingers ;)

Materials:

-green parts are TPU 95 A, 

• sleeves and gaskets should be printed rather strong
• silencer insert is printed also in TPU with zero walls, zero bottom and top layers and 20% gyroid infill to create an open cell silencer stuff. might also use some foam instead

-red parts in PLA or any other non flex material.

• try making a smooth surface where the inner and outer part of the rotational valve meet 

fine tuning:

if using with a Voron 2.4 be sure that the rear of the gantry/belts doesn't touch the lip of the air inlet. I made it extra flat and it works barely

you might need to trim the bibbusse that lock the valve in each 180 degree position a bit if it locks too hard  

I use a 19mm cpap hose rather than the standard 15mm, you might need to modify one sleeve if you use 15mm

for mounting just drill a 16mm and a 32mm hole in your enclosure, drill template is provided for positioning. then fiddle the sleeves into the holes and push the blower/silencer assembly in, should hold just fine.

if you want extra strength, use the housing with holder and screw it to the panel

i used this 7040 fan model for reference, thanks to https://www.printables.com/model/625653-10ws7040-cpap-blower-fan-model-and-board-holder