USB Drive Caddy — Hex-Grill Open-Front Cubby
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N×M open-front cubby for low-profile USB-C 'disc' drives. Drives lay flat and slide in from the front
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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 |
| 2 / 4 | Grid: N slots wide × M rows tall |
| 100/40/20 mm | Per-drive envelope (auto-sizes cells) |
| 4 mm | How far the drive sticks out the front |
| 0 | Outer envelope override (0 = auto). Set any of these to a literal mm value and the cell pitch back-computes from it. |
| 0.6 mm | Per-side cell clearance |
| 1.8 mm | Internal dividers + outer side walls |
| 2.4 mm | Closed back wall (bed face in print) |
| 2.4 mm | Closed top + bottom (Z faces) |
| 6.0 mm | Honeycomb cell flat-to-flat |
| 1.4 mm | Honeycomb wall thickness |
| 3.5/3.0 | Bottom skid width / lift |
Override on the command line, e.g. for a 3×3 grid:
Or set the outer body directly:
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.