- plastic of your choice - I sliced with Cura, and printed in ABS, fill at 100%. I printed without supports, but if you have trouble getting the eyes to stick to the build platform, supports or rafts might help. - elastic string - I strung the eyeballs using transparent, elastic beading cord. To be specific, Stretch Magic Bead & Jewelry Cord, .5mm diameter. It is perfect for the job, but be sure to glue the knots because this stuff hates being tied. I'm sure any elastic string would work fine. - paint - I painted mine using liquid acrylic paint meant for plastic models. I painted the interiors black, but that's for extra credit points.