Zipper Slider Replacement - V3

This is a 3D printable replacement slider for both standard and reverse bale zippers. A key feature is that it can be installed without needing to unsew the zipper ends. Reverse bale zippers (identified by the U-shaped bottom) are are usually found in water resistant zippers. This is a complete redesign. The primary weakness of the previous version was the connecting pin's reliance on Z-layer adhesion for strength. This has been addressed by printing the pin in the upright (vertical) orientation, dramatically increasing its strength. To support this print orientation, integrated support structure is included in the model. The built-in support generally works better than slicer-generated supports, but can easily be removed if you prefer to use your slicer's supports. To make slightly more room for the connecting pin I changed the design to use a rounded head. This also gave the option to increase the length of the rails for improved zipper guidance for smoother operation. Anothe