USB Drive Caddy — Hex-Grill Open-Front Cubby

An open-front cubby for small low-profile USB-C "disc" drives. The

drives lay flat and slide in from the front face; about **4 mm of

the body sticks out** of each slot so you can pinch and pull them

straight out. Closed back, top, bottom, and sides — everything but the

front. Decorative honeycomb perforation on the top and both side

walls; the back wall (which sits on the bed during printing) is solid.

Default build is a 2 × 4 grid sized for drives roughly **100 × 40 ×

20 mm** (e.g. the small slab-style USB-C flash drives + SD-card

readers). Two small bottom skids run along the X-direction walls so

the caddy rests on a desk like a sled.

Ships pre-rotated for printing. The exported STL puts the **open

face UP** and the back wall on the bed — maximum adhesion, zero

support material, every section of the cubby walls climbs upward.

Parametric. Edit the variables at the top of

usb_drive_caddy.scad:

| Variable        | Default | Meaning                                 |

|-----------------|---------|-----------------------------------------|

| cols/ rows| 2 / 4   | Grid: N slots wide × M rows tall        |

| drive_l/w/h | 100/40/20 mm | Per-drive envelope (auto-sizes cells) |

| expose_h | 4 mm | How far the drive sticks out the front |

| body_w/h/d | 0 | Outer envelope override (0 = auto). Set any of these to a literal mm value and the cell pitch back-computes from it. |

| slot_clear | 0.6 mm | Per-side cell clearance |

| wall_t | 1.8 mm | Internal dividers + outer side walls |

| back_t | 2.4 mm | Closed back wall (bed face in print) |

| floor_t | 2.4 mm | Closed top + bottom (Z faces) |

| hex_cell | 6.0 mm | Honeycomb cell flat-to-flat |

| hex_wall | 1.4 mm | Honeycomb wall thickness |

| skid_w/h | 3.5/3.0 | Bottom skid width / lift |

Override on the command line, e.g. for a 3×3 grid:

openscad -D 'cols=3' -D 'rows=3' -o caddy.stl usb_drive_caddy.scad


Or set the outer body directly:


openscad -D 'body_w=120' -D 'body_h=90' -D 'body_d=110' -o caddy.stl usb_drive_caddy.scad


**Print**

- Default-rotated as exported. **Back wall on the bed**, open face up.
- No supports anywhere. The hex perforations are vertical tubes in the
  print orientation, so they print cleanly without bridging.
- 0.2 mm layers, 3 walls, 15 % infill, any PLA / PETG. About 4 h on a
  Bambu P2S for the default 2 × 4 build.

The photo shows the printed caddy in mint-green PLA with two USB-C
drives slotted in — top view through the hex grill.