Dewalt DWS780 Compound Miter Vacuum Hose Adapter
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Dewalt 12" miter saw (~43mm OD) to shopvac 2-1/4 dust collection hose.
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- Creative Commons — Public Domain
I couldn't find a reasonable adapter online, so I made this one.
It should be printed in place without supports using PETG in the photos. I used 30% hexagonal infill, but less might do.
You may be able to increase the miter-side clamping fingers axial strength by adjusting the orientation to go lengthwise closer to parallel to the fingers, but support may be more tricky.
The fingers have a lip to grab the saw's clip indent. I tested both an 80 Lb zip tie and a wire pipe clamp. Both were satisfactory. The former has freedom to pivot, and the latter is a bit more secure.
Multiple vacuum hose ODs are included, measure the hose you want to use. Mine shown is 57mm and a perfect fit for the preferred hose, but it is too small for some of the hoses. If you have another dimension, use FreeCAD to edit adapter>Boolean>vacuum>Pad>vacuum_hose to your chosen OD (inside) and that plus 3mm (outside). The rest of the sketch should recompute from this without challenge. You may also be able to use a heat gun or hairdryer to deform the adapter to be a perfect fit for your preferred hose.
The expanding hose section includes octagonal wider sidewalls with curves to avoid stress concentration while adding rigidity.