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 Delta WASP 2040 with Clay Kit – LDM WASP Extruder.
Botijo (Spanish name) is a traditional “bottle” to preserve cold water.
History
Botijo was invented in 1611 in wikipedia you can read a lille bit of history https://en.wikipedia.org/wiki/Botijo.
Design
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.
Material
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.
To print the botijo he used a Delta WASP 2040 with Clay Kit – LDM WASP Extruder, using a 2mm nozzle with a 0.6 layer height. He had a really good result.
Firing
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.
Wow! Botijo this looks amazing, Clay has a tendency to keep the water cold but did not know shape does make it more effective, good to know!