No Support 3D Printed Catapult - Complete Design Explained

Complete mechanical breakdown of our winter catapult - a fully functional 3D print with NO supports needed! In this video, we explain exactly how this catapult works, from the printed-in-place roller bearings to the spring-loaded mechanism to the gravity-activated trigger system. Perfect for learning mechanical engineering while building an awesome winter toy! 🎯 WHAT YOU'LL LEARN: How the gear and spring mechanism stores energy Printed-in-place roller bearing design Gravity-activated trigger system Hexagonal pin assembly for maximum strength Interference fit techniques Print orientation for zero supports 📐 PRINT SETTINGS: Material: PLA Infill: 30% Walls: 3 Layer Height: 0.12mm Bed Size: Fits on 180mm² beds No supports, no brims needed PRINT DIFFICULTY NOTICE: This model contains very small elements (particularly the bearing rollers) that may be challenging on some printers. Our test setup: Printed successfully on a Bambu Lab X1C with Coolplate Supertack (9 prints, no adhesive needed). If you experience first-layer adhesion issues, try: - Ensure your print bed is clean and level - Reduce first layer speed - Increase bed temperature - Apply adhesive (glue stick, hairspray, etc.) We recognize these small features push the limits of many printers. We will try to avoid using tiny parts in the future. Thanks for your patience! 🔧 KEY FEATURES: Zero supports required Prints-in-place roller bearings on both sides Working gear mechanism Spring-loaded action Smooth trigger system Tested 50+ times with no maintenance needed 🔗 Free STL files: MakerWorld: https://makerworld.com/en/models/2115730-winter-catapult-snowball-fight#profileId-2289499 Printables: https://www.printables.com/model/1515476-winter-catapult-snowball-fight Creality Cloud: https://www.crealitycloud.com/model-detail/693ee3b4ce0060f056cbc18b Thingiverse: https://www.thingiverse.com/thing:7235383 Cults3D: https://cults3d.com/:3807886 ⏱️ TIMESTAMPS: 0:00 Intro 0:28 Design explanation 4:56 Print setup 6:42 Assembly Perfect for makers, educators, parents, and anyone interested in functional 3D printing and mechanical engineering! Download the free files, print your own, and start launching marshmallows into hot cocoa or snowballs at your friends! ❄️ 🔔 Subscribe for more no-support designs and engineering tutorials! #3DPrinting #NoSupports #MechanicalEngineering #STEMEducation