1. Wash the mussel shells and remove remaining waste.
2. Cook the shells for 15 minutes.
3. Heat the shells for 1 hour on 200 degrees in the oven. This will make the shells more brittle .
4. Grind the shells into a powder.
5. Sieve the grinded shells to obtain a powder with particle size of maximal 75 micron meter.
1. Measure the desired amount of sugar (50% of total weight).
2. Measure the desired amount of water (50% of total weight).
3. Add sugar to the water and stir until a gel has formed.
1. Measure the desired amount of mussel shell powder
2. Add binder to the powder until the right ratio is met. The powder:binder ratio is 1:0,4
3. Stir until the ingredients are well mixed into a smooth paste
To print the paste, a syringe that is actuated by compressed air can be attached to the positioning system of an Ultimaker (we used Ultimaker 2+). A digitally controlled pressure regulator has to be connected to the controller board of the Ultimaker, which makes it possible to control the extrusion pressure using pronterface
Diameter syringe 22.5mm
Nozzle size 0.84mm
Pressure 0.22–0.34 bar
Print speed 5 mm/s
Layer height 1mm
Layer width 1.5mm
Build plate temperature 30 °C