Truck drivers Kleen-flo funnel
thingiverse
I liked the way frapicchi designed it with 24 sides. This makes it 'grippier' than a smooth one would be. I also like the bottle top flange. This fits nicely over the rubber air line gasket. I added higher sides, a lip to keep spilling to a minimum and angled the spout so it pours towards the hose. There's a raised line opposite the angled spout so you know which way it's pointing.
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