Alpha 386 - Model Rocket

thingiverse

This model is a replica of the Estes Alpha, created to demonstrate that printed rockets can be surprisingly lightweight. To achieve this, I pushed the weight savings even further than usual, which means it needs to be printed thinly to avoid being excessively heavy. I employed a two-layer design for most components, with one perimeter layer and 0% infill. The body tube is only one layer thick (0.4mm) and can be printed using vase mode. However, the body sections may require some sanding to fit together properly. For component bonding, I used CA glue exclusively. The shock cord was made from about two feet of kevlar thread (available at McMaster), and a standard 12-inch Estes parachute was utilized. I printed my model in PETG with an ABS nose cone, as I wanted the entire rocket to be made from ABS, which is significantly lighter (20% so). Unfortunately, my printer lacks a heated enclosure, making it difficult to print ABS effectively. On its maiden flight, the model was launched on an A8-3 engine with three squares of wadding. The 0% infill fins proved to be quite fragile, so if they break off during printing, it's recommended to print them with greater than 0% infill for added stability.