So far, I've been using the Gaussmarkov (http://gaussmarkov.net/) libraries (http://gaussmarkov.net/eagle/lbr/gm-lbr.zip) mostly. I increase the pad size with the DRC to 20 mil (http://gaussmarkov.net/wordpress/tools/software/eagle/setting-all-pad-sizes/) and draw the signal traces with a thickness of 0.024.
After exporting the PCB image (900 dpi), I import it into Photoshop, invert the image and reduce the size to 40% of the original. I check scale of the printed image by seeing if the length from resistor hole to hole is between 0.6 and 0.7 minimeter.
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