DISCLAIMER: This is not an easy print however if you have the knowledge than you will greatly enjoy it! This makes a great teaching toy or desk accesory. Plus, IT ACTUALLY WORKS! All 3d print files are included and you will need to purchase some extra accesories before this engine will be operational. you will need to purchase roughly 30, 1/4-20 bolts, doesnt matter what kind of head, preferably button head. You will also need to purchase a package of bearings, size 1-1/8 OD, 1/2 ID, 5/16 thick. also recomended - sandpaper and some form of 3d print friendly lubricant. you can also purchase thin rubber sheets and create seal plates if you want a better working engine. you will also want 2 1.5in long 1/4-20 bolts with nuts to assemble the propellor