Lego Boost Competition Arrow

thingiverse

I was inspired by DrSnor's [Lego Boost Robot Spare Arrow](https://www.thingiverse.com/thing:3317558) to create my own version with even more accuracy to the original model. I started from scratch using TinkerCAD and a digital caliper, along with the Lego Boost arrow ("Competition Arrow") I have on hand. The initial prototype was printed in two halves and glued together with cynoacrylate ("Superglue", "Crazy glue", "Sekundkleber"), which worked surprisingly well but revealed some issues. The narrow rails that interact with the spring inside the shooter were too pronounced and lacked the rounded shape of the genuine article, so I had to trim them down slightly. To improve the design, I revised the model to round out and slenderize the rails, making them more in line with the original's specifications. Lego studs are spaced at 8mm (or very close to it), and all Lego dimensions are neatly divisible by 1.6mm. The prototype was weighted with white-tac, as its lightweight front-end made it prone to tumbling during flight. To counteract this issue, I included two additional versions featuring a built-in nose weight for added stability. Please note that Lego is a registered trademark of the Lego Group, and no infringement on their intellectual property rights is intended; rather, this is a heartfelt tribute to an extraordinary toy. It's worth mentioning that purchasing spare "competition arrows" from Bricklink is often cheaper and more convenient. These alternatives come with bigger, rubber-tipped ends, which are safer and fly better than the homemade version. In the works is a new design that incorporates one of the standard Lego tyres onto the end, providing an even weightier and safer rubber tip. **Disclaimer:** This design has not undergone any toy safety testing and should be used with caution. It can be fired from a Lego competition arrow shooter, but without proper modifications (such as replacing the front part with a rubber component), it may cause eye injuries or other harm. I disclaim all liability for damages resulting from your use of this design and recommend exercising extreme care when handling it, especially around children.