===== Create Mask with Photo =====
==== Gimp ====
  * load the picture.
  * color - desature - luminosity - OK
  * color - invert
  * Filters - Noise - Spread (H 50%; V 50%)
  * color - brightness ~95; contrast ~ 40
[[https://www.facebook.com/groups/287910088208745/permalink/528854347447650/|Source]]
===== Testing =====
[[https://www.thingiverse.com/thing:2603662?fbclid=IwAR1CsAukzuiSt0qx_VCWd5JHBwK4K6oOn9FknatsKHZ3nR_GEhM2ECu5Ezg|test print]]