This is a remix of a Zero head I found on Thingiverse about 2 years ago. Creator is attached with a link to the original file below; thanks for helping boost my dive into Blender! I took the original file and modified it, along with a smoothing in Blender. I removed a lot of the key elements that it originally had (like ears and collar) to bring it to my needs.

Creator: bermantdesigns
https://www.thingiverse.com/thing:1530622

I printed with a raft for better adhesion. Getting out the support from the mouth is a bit of a challenge, but if you're careful it can be done! This thing was pretty solid with an infill of cubic subdivision on 15%. Once again, this is a modification of bermantdesigns design.