Structural Fuel Rocket (Combustible ABS Rocket)

Main functional support structure is made of combustible material, like ABS, the tube holding an oxidizer rich solid rocket fuel powder, which will ensure the rocket is fully burned on flight from the thrust-nozzle side, also by atmosphere oxygen. Can be extended by tube connector piece. Literally burns up to thin air. Can be a 3d printed oxidizer infused ABS filament rocket, shape determines the burn/nozzle flow pattern.