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At the original scale they need just 16 X 16 cm to be printed, but they are more than 80 cm long! Of course, they can be printed as big as you want (for smaller prints some articulations may not work as intended).
For belt printers, the articulations work better if the snakes are printed from tail to head.
The tongue and rattle are designed to snap fit, but you may need to adjust a bit the scale of these two depending on your printer tolerances. I recommend printing them separately.
Check here the timelapse and post printing videos of the Snake and the Rattlesnake.
(*) Skull not included. It is an authorized modification from Fynngro’s Skull used as decoration (https://www.instagram.com/fynngb/)