Improved ball-joint wingnut for Anker car phone charger
Description
My wife has an [Anker PowerWave 7.5 Wireless Car Charger](https://www.amazon.com/gp/product/B07D9FYBMJ). It has a ball-and-socket swivel joint with a wingnut to tighten it. The original wingnut split, rendering the phone mount useless. Rather than buy a new wireless charger / phone mount for the car, I designed and printed an improved wingnut. This design has three improvements over the original: the wings have a steeper slope to allow the ball joint to swivel farther, the body of the nut is thicker to resist splitting, and one can have more than two wings. I settled on three (this is easy to change in the .scad file included). #### Customizing The included carchargernut.scad file can be used to customize this design. It requires my thread library `circlestack_thread3.scad`, which I developed for my [nuts&bolt baby dexterity toy](https://www.thingiverse.com/thing:4543428). The library can be downloaded from there. It isn't the most efficient thread library (I created it as a proof-of-concept) but I had it available and it works well, so I used it.
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