Lining them up is a tiny bit awkward - I think a conical cutout on both sides will help registers the parts together - but otherwise this has pretty much exceeded my expectations entirely.

This was also printed with random seam placement and scarf joint seams - that seems to work well these days, leaving an interesting but not undesirable texture. #3DPrinting

I will probably do the final version in clear polycarbonate for looks, and maybe even resin coat it. #3DPrinting

1. A Hyundai Kona's windscreen washer bottle will take exactly four litres of water before it starts to rush up the filler tube.

2. ACDelco Optikleen mixes at 10mL per L of water, so the litre of it I bought will give me 25 full refills in my Kona.

3. While putting the Optikleen away in the garage I found a full, unopened 1L bottle of Bar's Bugs I have zero memory of acquiring, so I now have approximately a lifetime supply of washer fluid.

They don't ship the 5L bottle, so it looks like I might be buying the little one from them. Can't spot anyone selling it off-the-shelf in Canberra.