1. Problem & Purpose
Smartphone drops happen instantly — and regret lasts.
This strap is designed to solve one simple but critical issue:
Don’t drop your phone.
2. Concept & Core Functionality
This is a single-part, soft-material strap that loops through your smartphone case.
Slip it on your finger, and it will automatically tighten during a fall to keep your phone secure.
What makes this strap different:
- Two distinct modes — one for movement, one for security.
- Switched by your finger — not an app, not a button. Just motion.
- Pinch and pull the strap to switch modes instantly.
3. Dual Modes: Safety and Freedom
You don’t choose the shape. You choose the purpose.
Strap Mode – Usability First
- Loop stays loose
- Ideal for everyday use: light, flexible, unintrusive
→ Priority: Comfort > Safety
Tightening Mode – Protection First
- Pinch and pull the strap to release the lock and switch to tightening mode
- The loop tightens and grips your finger automatically during a drop
→ Priority: Safety > Comfort
The strap lets you control the balance between freedom and protection.
4. Design Highlights
- Switch modes without removing the strap
- One-way catch mechanism inside the slit controls loop tension
- T-shaped stopper holds firmly in most smartphone cases
- No glue, screws, or tools required
- One flexible, support-free part — easy to print, easy to assemble
5. Printing Details
Designed for fast, flexible printing and material freedom.
- Print time: ~20 minutes
- Compatible with Bambu Lab A1 mini / A1 / P1 / X1 series (or any 18cm x 18cm+ build plate)
- Tested in TPU (Shore 95A)
→ Other TPU hardness levels are also compatible. Please feel free to test based on your environment.
No need to tweak slicer settings — just drop in the 3MF and print.
6. Use Cases
- One-handed operation while commuting
- Preventing accidental drops in bed or on the move
- Hanging from bags or belts
- Ideal for kids, seniors, or anyone with small hands
7. Assembly Instructions
- Pass the narrow tail through the slit to form a loop
- Insert the T-shaped stopper into the inside of your phone case
- Slip your finger through the loop
- Pinch and pull to switch to tightening mode when needed
No adhesives, no hardware — fully hand-assembled in seconds.
8. Closing Message
This strap makes "not dropping your phone" your default.
Through thoughtful geometry — not electronics — it adapts to you.
Wear it to stay safe.
Pinch it to engage protection.
Let your finger guard your phone — we turned that instinct into a form
Note: This strap is designed to greatly reduce the risk of accidental drops, but no system can guarantee 100% protection. Please use it with awareness of your surroundings and usage style.
Nanashi
