Marble ball release mechanism

thingiverse

Here are 21mm balls released one at a time from a 25mm electrical conduit based on a beam engine design. Drill two holes through the conduit to create openings for attachment points. Use model aircraft push rods to connect the servo arm and the top of "pistons", allowing smooth movement. Insert 6mm wooden dowel into each piston top, securing them in place with wood glue. Slightly sand the conduit to ensure a secure bond between the device and the conduit. Use a cable tie through the hole in the back to lock everything in place. This design works best when placed at a gentle angle. However, excessive tilt may cause more than one ball to pass through at once. Experiment with servo timing settings for optimal performance.