He also presented the show with his own version of the Blue Peter badge made out of solidaluminium, manufactured by Apple's equipment, using the programme's catchphrase: "Here's one that we made earlier".
Both, the housing and the potentiometer control as well as the rotary switch for selecting the source are made of anodised aluminium, while the front panel of the housing and the controls are milled from solid material.
In 2010 a team of researchers from Washington State University found that artificial regolith containing silicon, aluminium, calcium, iron and magnesium oxide could be used by 3D printers to create solid objects.