Drink Coaster

So, I'm not sure why, but the Scad file doesn't display right, however it does end up created right.
It's a drink coaster that mounts to your desk.
This is my first customizer so let me know if there is anything I did wrong or should do better next time. Hope to get some models printed over the weekend to show off what they look like.
(woo hoo! v 0.2 out, got it done faster than I thought I would)