A lot of people have used ESP8266 to add inexpensive WiFi connectivity to their projects, but [Oscar] decided to take it one step further and program an Arduino over WiFi with the ESP8266.

The Arduino takes this information and uses it to move the motors of the printer, positioning the marker over the correct location of the paper so the user can produce a dot.

This may be our first sand matrix printer, but it’s not our first sand 3D printer. Fail of the Week is a Hackaday column which celebrates failure as a learning tool.