The first button is a simple circle which has been given a small rim to make it have really cool color changes.
The next button is s hexagon with a nice rim just like the circle button.
The Third Button is a Reuleaux triangle which is a solid of constant width. A solid of constant width is essentially a non circular/spherical shape that can roll like a ball or wheel. If you are fan on Mazda RX7's you will know exactly what I mean! This button has a nice rim for color changes and a clean front. Here is another Reuleaux triangle model! https://www.prusaprinters.org/prints/52263-solids-of-constant-width/comments
All three of the buttons use a special string retention curve to allow for a perfectly clean top!
Print these buttons with the border facing up at .15mm layer height. Each button is 3mm high and about 20mm in diameter.
INSTRUCTIONS:
The author hasn't provided the model origin yet.