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🔪 Fully 3D Printed Retractable Fake Knife
This awesome fake knife is 100% 3D printed and perfect for cosplay, pranks, or just showing off your printer’s capabilities! The blade retracts automatically when pushed against something, giving the illusion of a real stabbing motion — without any danger. Safety and style in one! 😎
⚙️ Key Features:
🖨️ Prints in just ~2 hours – great for quick projects or last-minute prints!
🧱 Supports included in the design to make sure everything comes out crisp and clean.
🚫 No AMS or multi-material setup needed – it’s a single-color, easy print for everyone.
🎨 Sleek, realistic look – designed to look cool and convincing, but safe for all ages.
🌀 High-quality 3D printed spring – no metal, no glue, no screws. Just print and assemble!
🧩 No external parts required – every single component is printed. No extra hardware needed!
Whether you're into cosplay, stage props, or just want to fool your friends (safely!), this retractable knife is a fun and satisfying project to print and show off.
🛠️ Assembly Instructions
Follow the steps below to put it all together. Super simple – just slot the parts in place!
1.Remove all support material (make sure all traces of it are gone use bambu scraper to make sure otherwise it could mess up step 4)
2. Insert the fully 3d printed spring into the casing (spring will wear out over time print a new one using the print profile)
3. Add the fake blade to the casing and push the spring into the lower half of the knife blade
4. Clip the top casing on (Push to snap into place) (Make sure all support material is removed otherwise you could damage the casing as its one wall thick with 0.13mm tolerance)
⚠️ Disclaimers & Important Info
🔁 The 3D printed spring may wear out over time. If it stops working, no worries – just reprint the spring using the provided print profile!
❗ This is a FAKE KNIFE. It has no sharp edges and is not capable of causing harm. It’s purely for display, fun, or costume use.
🧽 Be sure to remove all supports carefully before assembly. It’s highly recommended to use the Bambu scraper or another plastic-safe tool – using too much force or metal tools may damage the case or break small parts.
⚠️ Use responsibly! This prop may look realistic from a distance, so don’t use it in public or in ways that could cause panic.
🛑 I am not responsible for what you do with this prop. Use common sense and be safe! 🙏
PolyNova
