This is a set of Black Widow Bites I made for a friends cosplay, I used modifications of http://www.thingiverse.com/thing:456900 AAA battery holder to power it and http://www.thingiverse.com/thing:505184 to make each piece connect together and articulate. This design only requires 3 AAA batteries to power the 3mm blue LED's I used a single 100ohm resistor and wired them in parallel. There is a small square hole for a 9mm x 4mm switch. For the wires I just used some old CAT5 cables. If you decide to do this make sure you used patch cables that are stranded and not solid wire. I recommend not using a brim on the battery holders because cleanup can be a bit of a pain and cause binding.