A Drayton Digistat 3+RF (I bought mine from here: http://www.amazon.co.uk/gp/product/B005SAZL60/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1) or a Digistat 2+RF. A bit of glue (superglue or similar) Some PLA (or other material might work)