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Coupler for 4" duct
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This is a quick-n-dirty connector for coupling 4" duct parts directly - parts that are intended to be connected to 4" ducting used for venting ABS fumes from my printer. The coupler is tapered for a tight fit, though it turned out a bit tighter than intended. It worked for my case, the FreeCAD source is included to tweak to your needs.
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