PVC Solid-Booster From 3D Printable Parts
grabcad
Made for 16mm inner diameter PVC pipe. You can change the diameter values for different tubings. The maximum tube length should not exceed 15cm. The nozzle can hold up to 3 seconds of burn time in my case and I am using %65 KNO3 and %35 Sorbitol (by weight) for propellant. Parts should be printed with 1.2mm or more wall thickness and >%40 infill.
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