Soft copper wire : 20 gauge ( wire diameter 0.8mm ) : cut the segments 1.5cm ( 0.6 inch) , 3cm ( 1.2 inch), 4cm ( 1.6 inch), 5cm ( 2 inch), 10cm ( 4 inch) Beads : 4mm ( crystal abacus ) ...

Tell us a bit about your background — and specifically, the intersection of your loves for engineering and crafting. I grew ...