A bit more calibrating going on... I rolled some beads from a sheet of PC rolled out on number 1 and cut out circles with my round cutters. (Jewellery Maker 25 Piece Multi Shape Clay Cutter Set VCZX34)
Then I made a round bead and measured the diameter with a gauge.
Smallest cutter: 9 mm bead
Next size up 12 mm
Size 3 13.3 mm
Size 4 16 mm
