FIT TEST COUPON (print this before a full house, ~10 min)
Print A and B flat, same filament and settings you'll use for the house, 0.2 mm layers.
Slot bar A has 5 slots opened by 0.06 / 0.10 / 0.14 / 0.18 / 0.24 mm per side (left to right).
Push the matching tab on bar B into each slot. Pick the tightest one that slides in by hand with light finger pressure and does not fall out.
  - Best is 0.10-0.14: use the STANDARD folder (0.12 mm).
  - Best is 0.18-0.24: use the LOOSE folder (0.20 mm).
  - If everything is tight, calibrate flow/XY compensation first.
Plate C has four crystal seats (about 3.8 / 4.2 / 4.6 / 5.0 mm wide) for flat-back stones; the houses use the 4.2 mm seat.