This is a clock face inspired by AndrewStaroscik's Two-Color Clock Face, http://www.thingiverse.com/thing:43815 , and designed to work in a clock like Make Magazines' http://blog.makezine.com/projects/pvc-two-faced-clock/ which is a current father /daughter project.I need all the help I can get with CAD and printing-- so I leave the deatails to you. For some reason, my circle is really a polygon with about 25 sides rather than a true circle. I presume I am doing something incorrectly in Sketchup.(BTW, I found the answer to the polygon issue here: https://groups.google.com/forum/?fromgroups=#!topic/sketchuphowto/B7AYR-fBhKE -but it looks like I would have to start from scratch to get more of a "circle" ).Anyway, print out starting with background color. When the numerals start, pause and switch to a different color of your choice.My first print (the one pictured) came out rough when it got the the numerals-- so your retraction and infill settings hopefully is fine tuned in better than mine.A clock movement like this should work:http://www.klockit.com/products/dept-157__sku-AAAVV.html