Silly snake fingers

This file incorporates the head of the ultimate-figet-snake and features the open and close mouth, just like the mouth of the original snake. Hopefully it will be hard to resist the opportunity to don some Medusa fingers and impress your friends, children, ... grandchildren?

There are several versions of snake fingers available. The original version is a bit looser and maybe easier to loosen up. This is the version that is featured in the GIFs. I am also including revised versions that has less of a gap around the "collar" in back of the head. The revised snake finger's mouth also opens a little wider. If you are interested, I also included a file for a snake finger with a larger head. Individually , the larger head looks more impressive, but if worn on multiple fingers, it becomes awkward to manipulate them.

Basically, it should be routine to do an FDM print of the model, unless you reduce the size of the print too much. The "cheeks and collar" of the head are quite thin and may not print well if the model is reduced in size. you may want to use the equivalent of Cura's "dynamic or super" settings when making smaller prints.
You also should be careful to get the first layer down well. If the first layer spreads out to fill in gaps between the pieces this can cause them to stick to each other. It may be helpful to adjust the "horizontal expansion" setting in your slicer to ensure proper spacing of the pieces.

After removing your print, you should expect to have to "break it in". The mouth should be easy to close after you remove the print. However, the jaws of the snake will likely require being worked up-and-down, etc., in order to wear down the print's imperfections that impair the movement of the jaws. In particular, you should squeeze on the collar while moving the jaws in order to finish working off the internal threads and burrs. Once you have loosened things up, just tilting the head forward and backwards should be enough to open and close its jaws. Though not necessary, a little bit of powdered graphite can help with this too.

When the mouth is closed, corners some corners protrude from the throat. You can snip them off to give your snake a better looking profile.

I have included multiple files of different sizes, but if you want a good fit, you almost certainly will need to use your slicing software to adjust the sizes of your prints to get them to fit the way you want. The medium sized model is the one I printed and used on my own skinny fingers.