This is part of a mega-project to create a comprehensive set of socket organizer trays.  Specifics for this print:

Manufacturer: Craftsman
Drive size 3/8"
Size units: SAE

In this group there are a small tray for the few 8-point sockets ever made by Craftsman, and a laydown tray for the small set of SAE deep sockets that includes the two SAE spark plug socket sizes.

Notations for layout type:

FW = fixed width (arrange tray segments vertically)
VW = variable width (arrange tray segments horizontally)
NL = no lettering
WL = with lettering
SP = includes spark plug rubber-lined socket sizes

The OnShape CAD is here: https://cad.onshape.com/documents/2bbe0c163ddc347efd6b4d3f/w/eae67d546012922cc1ffda76/e/4837165c753cd6d330c36ea1

This OnShape project is used to define all of the socket trays in this group of prints.  The link above may not point to the specific manufacturer/drive/units in this print.  If you explore the project the folder structure will be evident.

A lot of FeatureScript is used to define the socket sets and layouts, and make almost all the layout sizing/spacing calculations automatic.

Filament: PETG (Prusament PETG Ultramarine Blue)

Layer Height: 0.25 first, 0.30 thereafter

Infill: 15%