[kingbedjed]

The request

Slack #labware-requests, requester Slack user U0APRMP9RH8, 2026-10-30 (permalink):

S-bio U-bottom 384 well plate Cat no. MS-9384U

Closes #40

Decisions needed

1. MS-9384U vs MS-9384UZ. The request names MS-9384U. S-Bio's own documents list only MS-9384UZ; FUJIFILM Wako lists MS-9384U (Europe/Asia) and MS-9384UZ (US) both as "PrimeSurface 384U Plate". This file treats them as one mould, uses the MS-9384UZ row of S-Bio's dimension table and names MS-9384UZ in notes. Is that right, and which code is on the requester's box?
2. Square opening. S-Bio's table gives a well "diameter" of 3.3 mm (top) / 2.92 mm (bottom). The product photo shows square, round-cornered openings on the 384-well PrimeSurface plates, and the published volume agrees with a square (a 3.3 mm square tapering to a 2.92 mm circle over 12 mm holds ≈106 µL, the brochure maximum; a 3.3 mm circle would hold ≈91 µL). The file records top_shape: square, diameter_top 3.3 mm (side), shape: circle, diameter 2.92 mm. A look at a plate in hand would settle it.

What is included

file	plate	pitch	grid	bottom
S-Bio_MS-9384U_384_well_plate.json	S-Bio PrimeSurface MS-9384U 384 well	4.5 mm	16 × 24	clear, U, 0.8 mm thick, 2.92 mm dia.

Figures

Rendered from the JSON on this branch	S-Bio's own
	S-BIO PrimeSurface dimensions to support instrument setup, page 1, cropped to the table (last row is MS-9384UZ)
	S-Bio PrimeSurface product photo from the product page; the two 384-well plates are on the right (white 384W top, clear 384U bottom)

Sources used

• Controlling: S-BIO PrimeSurface dimensions to support instrument setup, one-page table, PDF dated 2017-08-22 and modified 2018-04-30, with no revision number. S-Bio publishes no dimensioned drawing for this plate.
• PrimeSurface brochure: MS-9384UZ, clear, round bottom, maximum well volume 106 µL, individually packed, 20 per case.
• FUJIFILM Wako listings for MS-9384U and MS-9384UZ (U bottom, 0.1 mL, radiation sterilized).
• Trap: Sumitomo Bakelite's Japanese spec pages (sumibe.co.jp) that S-Bio links now return 404.

Judgement calls

• diameter = 2.92 mm is the table's "bottom" value and diameter_top = 3.3 mm its "top" value. The opening is taken as square (see Decisions needed).
• S-Bio's "Well Bottom Elevation" 2.4 mm is the top of the floor: 2.4 = 1.6 ("Distance to Bottom of Plate") + 0.8 ("Well Bottom Thickness"), and 14.4 plate height − 12 depth = 2.4. So floor_height 2.4 mm, bottom_elevation 1.6 mm, bottom_thickness 0.8 mm.
• working_volume_max is the table's 100 µL well volume; the brochure's 106 µL maximum is in notes.
• skirt_height 2.5 mm is the table's "Flange or Skirt Height". There is no drawing, so the skirt outline and flange width are not recorded and nothing was scaled.
• Not published, so left out: plastic (no S-Bio document read names it), lid and height with lid, wall thickness, U-bottom radius (the bottom is taken as a hemisphere), and minimum working volume.

Testing

• pytest -q: 184 passed.
• lint (ruff 0.15.22 check + format --check, ty 0.0.74 via pixi, as in lint.yml): all checks passed.
• Geometry check:

S-Bio_MS-9384U_384_well_plate.json
  name            'S-Bio PrimeSurface MS-9384U 384 well'   part 'MS-9384U'
  footprint       127.760 mm x 85.480 mm x 14.400 mm
  grid            16 rows x 24 cols, pitch 4.500 mm
  well            square opening over a circle bottom, 3.300 mm at the top, 2.920 mm at the bottom, 12.000 mm deep, u bottom
  A1 centre       12.130 mm from left, 8.990 mm from top
  far margins     12.130 mm right, 8.990 mm bottom
  centred A1      12.130 mm / 8.990 mm  (delta -0.000 mm / -0.000 mm)
  ok

🤖 Generated with Claude Code

Opened by the add-labware skill of ramona-claude 0.16.0 (ramona-llm c377eb0, prompt bc769991).