I was thinking it would be cool to plaster the whole outside of my coffee cup with RGB LED's (WS2812B).

Then I measured the cup and did the math.

Diameter = 3.24" Height = 3.83" Circumference = PI * Diameter = 10.178" Surface Area = Height * Circumference = 38.98 sq. in. Flex PCB Cost = $15/(sq. in.) * Surface Area Board cost = $584.70

That is quite expensive and I don't even have the components yet!

However, that is three copies of the same board so if i did a 1/3cup design I could combine them to cover the whole coffee cup.

Area = 12.99 sq. in. Cost = $194.90

That's still expensive for a design I have not proven yet.

How about trying this.

Area = 2 sq. in. Cost = $30 However I receive 3 boards. Therefor Total Area = 6 sq. in. Coverage = Area of PCB/ Surface Area of Cup * 100 = 15.39%

Now I just need to figure out the layout and the routing.

Enjoy a photo of the coffee cup I used for my measurements.

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