I made it at TechShop! www.techshop.ws.
ABS is only available in a couple of colors. This is how you can paint it to whatever color you want.
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Step 1: Prep
Many sources suggest scuffing the smooth side with steel wool or sandpaper, you may want to do that but I had good results without it. I did wash the plastic thoroughly with simple green. You can also use dish soap that doesn't have hand softeners,
Step 2: Paint It
TechShop has a nice paint booth with ventilation, paint the plastic with a couple of light coats to minimize chances of runs and defects. I painted the inside first so I could flip it without marring the paint. Allow about 10 minutes between coats.
Step 3: Allow to Dry
Let it dry for 30 minutes to an hour before touching it. Now you're pretty much done!