Just in time for Halloween, I designed these Flexible 3D printed TPE Urethane black widow spiders. They are 10 cm across. There are 2 x 5mm holes for LEDs to fit in from the bottom, which gives the red hourglass an eerie glow. I wired 2 red LED is series, and connected them directly to an 18650 LiPo battery. For most red LEDs this gives just the right voltage drop.
I uploaded it to Thingiverse here if you want to give it a try.
