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3" x 2" downspout to 4" pipe adapter — image 1
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3" x 2" downspout to 4" pipe adapter

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Adapter to connect 3"x2" downspouts to 4" pipe.

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Model information

License
Creative Commons — Attribution

3d printable downspout adapter that slips over the downspout and can snap into 4" corrugated drainage pipe, or sit in a 4" non-corrugated PVC pipe. 

These adapters are usually available at the hardware store and made of durable HDPE that weathers much better outside, so I recommend the store bought version if you can get it. 

If you can't get a premade one, this should do in a pinch. This print can be much cheaper though - costing about 1/10th the price of the hardware store version. (As of 1/21/25, $12USD retail vs ~$1.50USD in filament). The topology is optimized for 3d printing, so there are no overhangs. I expect the freeze/thaw cycle will start ripping apart the layers in a season or two, so this should not be considered a good long term solution. (I'd love to be wrong though)!

I've included a parametrized f360 file, so you can adapt it to your own needs. 

Printing tips

  • No supports required
  • Low infill (5%)
  • Recommended layer height: 0.2 - 0.30
  • Recommended nozzle size: 0.4
  • Consider printing with a brim if you have adhesion issues. 

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Enjoy your spout and let me know, if you make one for yourself!

Designed with Autodesk Fusion 360 Personal

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