CPAP adjustable flow restrictor valve for e.g. ABS
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My CPAP fan has a minimum speed which is too high for ABS cooling, so I direct some of the air out of the flow path.
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Since the minimum setting for my CPAP fan on Voron 2.4 / Stealthburner is still too much of cooling for ABS, I designed this quick&dirty flow restrictor.
In one position, there is no restriction, as used for PLA (I run the fan at 50% then).
In the other position, the hole is small and the rest of the air is allowed to move out of the centerpiece. I run 18% fan speed as the minimum my fan allows. I drilled the center hole slowly wider, until I got the cooling I needed without risking warping. So you have to do this on your own, to match your setup.
Downside of this product is, that for restricted materials like ABS, air is not filtered and its being pushed out, thus soaking in fresh air into the printer enclosure which may affect chamber temperature. A better way would be to place this whole part inside the printer, but I haven't gotten to do it yet. Also the accessibility is less convenient then, as right now it's next to my spool holder, so I can adjust whenever I change material. Alternatively, in the future I may create a design which lets another hose feed the air back into the chamber…
So far, this works very well and I can have little cooling while still using the CPAP fan.
Assembly instructions:
The quick&dirty solution requires the hose/fan connectors to be glued to the centerpiece. The slider just slides in and will klick into place in the two positions.
Since the CPAP on my Voron pulls air from inside, with higher chamber temperatures the air will have some temperature as well. Thus, best print this in ABS instead of PLA. See photo for my setup.