Head: 3mm height, 14mm OD + .6mm diamond knurling on the outside, flat top. Shank: 3mm smooth length, 10mm threaded length. See SCAD I generated with Claude Code, it requires BOSL2. Allows for adjusting dimensions very easily. Printed well upside down with PETG at high speed, .6HF nozzle, 0.2mm layer height.