Is there a 3d printed door latch, like the inside of a door that opens and closes with the knob? The door gets wet and two latched rusted out already. Thought Plastic might be a better idea. Also thought it would be really cool 
Yes, 3D-printed door latches are available. Creating a plastic latch for the inside of a door is a practical and innovative solution, resistant to rust. Numerous designs can be found online, allowing you to customize the latch to your specific door requirements. This offers both a functional and aesthetically pleasing alternative to traditional metal latches.