The base was a free 3D wearable wolf skull model from Thingiverse. The bottom jaw didn't fit right, so I had to remove the back part, and over the winter I got around to crafting a fix for that. The new jaw section is EVA foam, painted with white acrylic, sealed with some poly stuff I found under my kitchen bench from house work.
I tried really hard to hide the seams where it connects by the molars, hopefully it's convincing at a glance? The character is my fursona, who is a necromancer-druid, so that's why there's plants everywhere.
The main image was actually a test piece, but I was so happy with the shape and size that I just used it as the final piece. The image was taken blindly when I was trying to see if it was fitting correctly, forgive my fingies being so visible.
You likely wouldn't notice the seam from a distance, but if you wanted to try to improve it you could fill it with Apoxy Sculpt it is a 2 part epoxy clay, mix it together and fill your sceam. You can put a bit of water on your finger and smooth it out. It can also be sanded. You would just need to do some light painting to make it match afterwards.
An even cheaper solution would be baking soda and super glue. Don't use the gel super gul, the thinner the better. fill your seam with baking power, drip super glue on it. It hardens almost instantly to a plastic. It is sand-able and paintable as well.
Thank you for the info, they're interesting solutions! My main issue is that in order to fill the seam, it would need to match the rest, which has barely-visible 3D print lines. I COULD sand and paint the whole thing, but if I do that much work, I may as well wait till I get a better one with a moving jaw, which I plan anyway.
I'm honestly so nervous about making something worse that the idea of using super glue or anything not 100% reversible *terrifies *me.