This my attempt at modeling a fully print in place cobra with a rearing head, it can all be printed in one part without any support and can be scaled up as much as your printer allows. 

Print settings:

• No support
• No raft
• 0.2 layer height or lower for better accuracy
• 20% infill to ensure strength in the head
• Note: If you don't trust your bed adhesion you might want to add support or a brim around the head