Rainwater Diverter

In one corner of my section there stands a black barrel that I think the previous owners intended to use as a rain barrel. As the forecast for this weekend was for rain, I thought I'd hook it up.

As I have a 3d printer, I elected to print the parts needed to divert water from the downpipe. I wasn't happy with any of the designs online, so I made my own.

Features:

• From the top it's a complete tube. If you dropped a tennisball down the downpipe it would come out the bottom. Instead of any protrusion it uses surface tension to pull the water off to the side.
• Placement of holes means no water can “miss” the holes. This makes it efficient even at very low flow rates.
• The holes are small (3mm) and there are no protrusions. So debris should not get stuck. We'll see how this works in practice.
• Barb for a 10-12mm ID hose (normal garden hose in New Zealand)

Does it work? Yeah, very well. In my tests no water made it past the diverter at all. Perfect!

I've included the freecad file. It's somewhat parametric, but would need a bit of fiddling for different diameters. If there is interest I can finish parameterizing it.