This is a remix of timbo's ID Card and RSA Token Holder. I changed the width to hold a single ID card for work. It took me several tries to print with acceptable results... probably because I fileted all of the edges to make it smooth.
The final winning combination was to print wtih an 8-line brim, vertically, with supports. The supports only print inside the RSA holder, so they don't affect the visible surface finish. without the supports, it wanted to curl when initiating the sharp edges