The model I made for last Halloween—nothing could be cooler than a mechanical skull mask that can open and close its mouth to switch between different expressions.

A1 mini is capable of printing it.

The model requires two rubber bands and two strings for securing it; any areas that aren’t firmly held in place can be reinforced with a bit of glue.

##The interlocking opening-and-closing mechanism needs to be lubricated with grease; otherwise it will seize up##