3D printed clay natural refrigerator (Botijo)
Natural refrigerator (Botijo) is a project by Gianluca Pugliese, a maker that has collaborated with WASP for many years. To print the botijo he used a DeltaWASP 20 40 with Clay Kit – LDM WASP Extruder.
Botijo (Spanish name) is a traditional “bottle” to preserve cold water.
Botijo was invented in 1611 in wikipedia you can read a lille bit of history https://en.wikipedia.org/wiki/Botijo.
Gianluca studied the shape to obtain the same efficiency, but with a little bit of design, and because the goal is to print it with a 3D printer, He had to calculate the right hoverhang.
Gianluca tried many shapes including a lowpoly and thin shell. You can download the STL file here: http://www.thingiverse.com/thing:1821124.
The traditional one is made in red clay, to print Gianluca tried Paperclay that is a composite with cellulose, paper and clay. When you fire the piece, the paper will gone and the piece results well porous. Cellulose helps during the printing to obtain printing with big hoverhang.
Like all kinds of Clay you have to fire the piece, in this case paperclay needs a 1250 degree oven, in a ceramic shop you can choose what kind of temperature you needs in base of your clay.