Do not ignore and throw small pieces of plastic waste as they can be harmful when they accumulate. I designed a hangable plastic trash bin to remind us the importance of small plastic waste impact on the environment :) Hang it next to your printer and throw the small wasted plastic in it. In time, you will see how much plastic it will accumulate.
I just used support for the hinge in the head part. I suggest that print the front and the back of the head together with 0.1 mm resolution so that they can be connected. I have bad printer, so I broke the face into 2! However, you can achieve better results with your printer :) 2X scale will give you more space for bigger plastic waste.