This is an easy to print adapter to add LED's to your compressed air rockets. Allows you to launch at dusk or at night for a rocket light show - plus helps you find it in the dark... Fits air rockets based on a 1/2" pipe launch tube. Works well with Air Rocket Works compressed air rocket parts: www.airrocketworks.com Print all 3 parts, Lower LED Housing.STL, Upper LED Housing.STL and LED Bend Tool.STL Test threads and adjust printer settings if needed. Locate (3) 5mm LED's and 2 AG13/LR44 batteries. Bend and trim LED legs using the 3D printed tool. Using the multi-image above, start in the upper left image by orienting the LED with the short leg (adjacent to the flat on the LED) near the top Bend the long LED leg straight down Bend the long LED leg to the right to fit in the groove Bend the upper LED leg to fit in the upper groove Mark the LED legs between the two arrowheads Remove and trim the LED legs, then double check length and bends in the tool Test the LED polarity by checking it across the batteries as shown. Repeat with 2 more LED's Install 3 bent LED's along with 2 batteries into the cavity in the Lower LED Housing. Adjust the upper lead so the LED's are not illuminated. Thread the Upper LED Housing part into place, and adjust LED legs to have it turn on/off the LED's with a twist. Using superglue, install the lower LED housing into a ABS Body Tube. Trim and apply sticker fins Insert foam nose into Upper LED Housing Turn on and LAUNCH! Check out our other "launchables", left to right in the third image: CARB (Compressed Air Rocke Bounce) - Our standard rocket, foam nose, ABS body tube, sticker fins ARG (Air Rocket Glider) - This launches like a rocket and glides down like a plane Lego MiniFig Adapter - Launch your favorite (or least favorite) Lego MiniFig with this adapter LED Rocket Adapter - This project CARP (Compressed Air Rocket Parachute) - Currently under development