plot thermometer / clock EXPO pen parts

These EXPO fine point dry erase pen compatible parts are for use with smily77's "v2 version" of the plot clock / thermometer:

https://www.thingiverse.com/thing:371248

Actually it's technically not a remix rather than a redesign, since the mesh kept breaking when I tried 'remixing' the original STL's. So I redrew the parts from scratch using freecad. As a bonus the STL's are higher resolution, and it becomes easy to create STL's to fit other pens as needed. The Freecad file is included in case you feel like doing just that.

I also uploaded Plot_thermometer_Clock_final_V1_1c.ino with several improvements & fixes:

--Always lower the pen to "lift(0)" while parked. This helps get a tighter seal between the marker and eraser/cap when not in use.

--Added option to show time in 12hr format (removed the leading "0" from 12hr format).

--Added option to show temperature in Fahrenheit.

--Added ability to display temperatures >=100 (...use Fahrenheit on hotter days too).

--A