Tactical Dog Poop Bag Holder 2.0

This poop bag holder is TOUGHER! 💪 I used hexagon architecture to reinforce the walls and top loop strength. Flat wall surfaces make good embossed text areas for custom pet names. I made a low profile screw-on lid (bottom) that has knurled grip for all-weather dog-walking operations.

I was inspired to make a design to improve upon the cheap store-bought options that broke all the time. Some 3D print models were weak at key points, like in the loops, threads, lids, especially rods in the middle. I had 2 other models break: 1 at the loop, 1 internal cylinder.

Feedback on prior design was that the loose rod was too tricky after bags ran low or smaller bag spools were used. I opted for a fixed that reinforced the center rod. Instead of cylinders, I used a 3D printing trick to use a "plus" shape. This shape is engineered to be stronger. Doubling down on strength, the top rests in a notch at the top of the body so it doesn't bend when bags are pulled. Tripling the strength, I added an internal void that starts below the surface and extends into the rod, to force the slicer to add more layers at the point of connection to the cap. All shown here:

I used a clever trick to made 3D printer friendly threads: the main body has notches in the threads to prevent loose extrusions. Without this, it is common for strings of filament to float/detach during extrusion of the interior circle edges. 

This design is an improvement on predecessor: