Calendar puzzle

This is a calendar and also a puzzle. The original idea came from one of my favorites - [TopSpin](https://www.thinkfun.com/about-us/our_story/extended/)

**updated 17 July 2021

###List of files (STL)

calendarPuzzle_Months
calendarPuzzle_Days
calendarPuzzle_BlankButton
calendarPuzzle_dotButton
calendarPuzzle_smileButton
calendarPuzzle_mainbody_v3
calendarPuzzle_ring_v4 (this one fits better, previous version was too loose)


###Display option

A ring (optional) in a different color can be used to circle the date and kind of make it stands out a bit.


###Buttons for month and day

Buttons for months (calendarPuzzle_Months) and days (calendarPuzzle_Days) are in separate files in case you like multi-colors. 12 buttons for the months of course, and considering the day can be viewed as two digits (01 to 31), 12 buttons (0-9, 1, 2) were made for the days. The space in this calendar can hold a total of 26 buttons, that means we can include two blank buttons or emboss w