Ball Valve (Customizable)

Ball valves are great for projects, but I'm always a little floored by the price.
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Like $15 bucks for 5 cents worth of plastic? Really? And my idea calls for... about 30 of them so...
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NOTE: This is currently work-in-progress and will almost certainly leak like crazy. See below more details.

UPDATE 01/16/2019:
1) Can now generate individual parts in "best" printer orientation
2) Made the math for seals work better
3) Can now select resolution