Nanakatana V2 – Twist-to-Open Banana Katana

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🆕 Update Notice for Previous Version Users （2025 Nov 17） Thanks to feedback from makers who printed Nanakatana V2, this model has now been updated with refined dimensions for a stronger and smoother mechanism. The following parts have been adjusted and improved:

- Peel cap gear– enlarged gear module for higher strength and smoother torque transfer

- Peel Stick – enlarged gear module for higher strength and smoother torque transfer

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If you printed the older version, you may notice the new revision operates smoother and more durable. Reprinting the updated parts and Peel Cap together is recommended for the best experience.

Nanakatana V2 – Twist-to-Open Banana Katana

An easier, smarter evolution of the banana sword. Many users found the Banananife fun but tricky to assemble — so this version was designed to be simpler, cleaner, and entirely magnet-free. Nanakatana V2 replaces the old peel-by-hand cap with a 60° twist-to-open stem, which smoothly opens the peel cap and lets the banana blade swing out like a collapsible katana. 🧠 Concept / Inspiration This design brings together the Banananife’s clever peel-opening motion and the Nanakatana’s playful form. I wanted to create a banana sword that anyone can assemble easily, without magnets, glue, or tuning. By twisting the banana stem, the internal cam unlocks the peel cap — turning the fruit into a toy katana with pure printed mechanics. ⚙️ Features & Mechanism

- Twist-to-open stem: rotate 60° to open the peel cap and deploy the blade.

- No magnets or glue required: fully mechanical printed structure.

- Simpler assembly: redesigned joints and tolerances for a smoother build experience.

- Compact but scalable: ~35 cm at default scale, can be enlarged freely.

- All-printed parts: prints and assembles without any hardware.

🖨️ Print Profile (Recommended)

- Material: PLA (all parts)

- Layer Height: 0.2 mm  Nozzle: 0.4 mm

- Supports: manual — enable only where necessary

- Support Interface: 4–5 top interface layers for easier removal

- Wall Generation: Arachne

- Assembly: snap-fit only, no glue or hardware

🧩 Print & Troubleshooting Tips

- Supports: remove carefully around interface layers to avoid deforming snap features. Apply PLA/PETG support material on the support top interface layers to ensure a clean and smooth surface finish.

- Scaling: when scaling up, check clearances, as snap-fit tolerances scale linearly but material behavior can vary.

🌟 Why It’s Special Nanakatana V2 keeps the fun of the original banana sword but with smarter geometry and smoother assembly. It’s a showcase of how good design can simplify mechanics — transforming a meme into an elegant, fully 3D-printed toy 🍌⚔️

From over-engineered bananas to unnecessarily mechanical citrus. Limau Link is now live. Tap the image to see it in action. 🍊

🍌 Also from the Banana Series If you enjoy this one, check out Banananife V2 – OTF Blade + Comb Upgrade. Before you deploy it… you peel it.

if u want a bigger banana…..

Boost Me💬 Support & Feedback If you enjoy this design, please leave a rating or drop a Boost — it really helps and keeps me motivated to bring more fun mechanical models to life! 🙏 And if you print or remix it, I’d love to see your version — share a photo in the comments 🍌✨