Add short OpenTrons 24-well tuberack definition

docs/resources/library/opentrons.md

@@ -39,6 +39,11 @@ Unfortunately, most of the other labware (plates) is missing information that is
 - `opentrons_24_tuberack_nest_0_5ml_screwcap`
 - `opentrons_24_tuberack_nest_1_5ml_screwcap`
 - `opentrons_24_tuberack_nest_1_5ml_snapcap`
+
+| Description | Image | PLR definition |
+|-|-|-|
+| 'opentrons_24_tuberack_generic_1point5ml_snapcap_short'<br>Part no.: 3405002<br>[manufacturer website](hhttps://www.thingiverse.com/thing:3405002) | ![](img/opentrons/ot2-1.5mL-tube-rack-24w.png) | `opentrons_24_tuberack_generic_1point5ml_snapcap_short` |
+
 - `opentrons_24_tuberack_nest_2ml_screwcap`
 - `opentrons_24_tuberack_nest_2ml_snapcap`
 - `opentrons_6_tuberack_falcon_50ml_conical`

pylabrobot/resources/opentrons/tube_racks.py

@@ -1,5 +1,51 @@
 from pylabrobot.resources.opentrons.load import load_ot_tube_rack
+from pylabrobot.resources.resource_holder import ResourceHolder
 from pylabrobot.resources.tube_rack import TubeRack
+from pylabrobot.resources.utils import create_ordered_items_2d
+
+
+def opentrons_24_tuberack_generic_1point5ml_snapcap_short(name: str) -> TubeRack:
+  """
+  OpenTrons 24 well rack with the shorter stand; 30mm shorter than default stand.
+  3D print available here: https://www.thingiverse.com/thing:3405002
+  Spec sheet (json):
+  https://raw.githubusercontent.com/Opentrons/opentrons/edge/shared-data/labware/definitions/2/opentrons_24_tuberack_nest_1.5ml_screwcap/1.json
+  """
+
+  WELL_DIAMETER = 9.2  # measured (circular -> inscribed square sizing is used elsewhere; see below)
+  WELL_DEPTH = 37.40  # measured
+
+  # PLR's OT loader converts circular diameter to a square footprint using diameter / sqrt(2).
+  # Your earlier code already used inner well width/length of 9.2; if 9.2 is the *square* size,
+  # keep it. If 9.2 is the *diameter*, convert like load_ot_tube_rack does.
+  #
+  # If 9.2 is "inner square width", use:
+  well_size_x = well_size_y = WELL_DIAMETER
+  #
+  # If instead 9.2 is a measured *diameter*, use this:
+  # import math
+  # well_size_x = well_size_y = round(WELL_DIAMETER / math.sqrt(2), 3)
+
+  return TubeRack(
+    name=name,
+    size_x=127.75,  # spec
+    size_y=85.50,  # spec
+    size_z=48.5,  # measured (short stand)
+    model=opentrons_24_tuberack_generic_1point5ml_snapcap_short.__name__,
+    ordered_items=create_ordered_items_2d(
+      ResourceHolder,
+      num_items_x=6,
+      num_items_y=4,
+      dx=13.5,  # measured
+      dy=13.5,  # measured
+      dz=12,  # measured
+      item_dx=19.89,  # spec
+      item_dy=19.28,  # spec
+      size_x=well_size_x,
+      size_y=well_size_y,
+      size_z=WELL_DEPTH,
+    ),
+  )
 
 
 def opentrons_10_tuberack_falcon_4x50ml_6x15ml_conical(name: str) -> TubeRack: