Overengineered dog leash handle with rugged design, poop bag container and treats dispenser

Meet Trufla: a lovable, but slightly too energetic furry tornado who joined my life from a dog shelter last year. Our daily walks often feel like a tug-of-war competition, with Trufla determined to show me who's boss. This Flash Contest was a catalyst to finally design something that will make our escapades a bit easier, safer, and more comfortable.

Introducing “TrufLeash”: a 3D printed, rugged leash handle specially designed to withstand the enthusiasm of our beloved leash-pulling companions.

Features:

Hand Ergonomics: I spent one week researching what makes handles “ergonomic.” After prototyping a bunch of iterations, I achieved a design that I believe provides a secure and comfortable grip. There is also a TPU version available if you prefer a flexible filament.

Safety: This handle has undergone testing on humans, i.e. two people intentionally attempting to pull and rip it apart, using what we believe was force beyond what any dog could muster*. Printing it in PLA at 40% honeycomb infill proved to be sufficient to withstand the test. The leash loop can still be worn on the wrist for added protection, and there are also two holes for attaching an additional fastener or wristband.

Modular Design: TrufLeash features two ports that can accommodate additional modules. Currently, there are three options to choose from: two different containers and an additional control grip, in case you have a very large dog or perhaps want to try kite surfing with it (although, I strongly advise against the latter).

There will be more modules coming in the future**. 

How to print:

All parts can be printed without supports, using a 0.2 layer height and the default orientation. I recommend using ABS but PLA should also be fine at higher infill. I printed the handles with a 40% infill, honeycomb pattern and achieved good results, but you may consider increasing the infill further depending on the size and strength of your dog.

If you opt to print the TPU version of the grip, it's advisable to print it slowly and with a brim, just to be safe.

One more thing - 3d printed items are generally not considered food-safe, treat container is designed to store small, dry treats. For extra safety you may want to use food-safe PETG or treat the container with epoxy.

How to put it together:

I created a short assembly video available here.

The Field Sustenance Dispenser also requires two 6x4mm round neodymium magnets for a firm lock. 

To install a module, please push it inside the module port and rotate it approx. 45 degrees. It may require a little force. Rotate back and pull away from the module port to disengange.

***

With TrufLeash, you'll bid farewell to leash-induced arm workouts and sore hands. Get ready to transform your strolls into a pleasurable and safe experience—one leash handle at a time.

*Disclaimer: the test was real and the handle itself has been designed with my own dog in mind, I however don't know how strong your animal is or how robust your prints are. Please use at your own discretion.

**my sarcastic friend suggested the following modules: Self-destruct module, emergency horn, pepper spray, airtag, compass, blinker, laser…