Removable bezel screws into the printed base

Two M2 heat-set inserts go into the existing base holes and the bezel screws in place. It works well, and the base didn’t need a reprint. Don’t glue the bezel to the base.

1. Use two M2 × 4 mm heat-set inserts, nominal OD 3.2 mm, in the existing B1/B2 base holes.
2. Secure the bezel using two DIN965A M2 × 6 mm Phillips countersunk screws (90° head, max OD 4 mm, max head height 1.2 mm).
3. The two bezel halves may be bonded at their own fixed seam. Keep adhesive off the plunger guide, moving parts, screw seats, and base.

See the current step-linked hardware list and as-built button notes.