Remix of flioink's amazing samurai-inspired mask #3 (my personal favorite of them all). Teeth and mask are now separate parts to enable multicolor printing:

• Option 1: Print separate parts, then use some CA glue to put all pieces together.
• Option 2: Print the “Assembly - Multicolor" using a multicolor printer.
• Option 3: There's also the “Assembly - Monocolor" as a single, solid piece.
   

Printing:

• I highly recommend using the Tree Supports for both face and teeth.
• The face can be laid down on the plate, resting on its jaw and chin. 
• For the teeth, try to print it so that the contact point with the supports remains hidden in the final assembly and the layer lines remain perpendicular to the teeth.

*You can test your printer capabilities with my QuBenchy - 3D Printing Torture Test Cube:

For those wondering about the pictures, I'm using some braided cotton cord with a 5 mm diameter.
 

This is mask #1 of a series of three masks. You can check them out here:

• Oni Mask #1
• Oni Mask #2
• Oni Mask #3
   

Feedback is welcome. Cheers!

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Rendered in Blender, using Blender Boom's Desk Scene and @Az3Dip's Ender 3.