This is a universal 3-slot end cap for triple 4040 (120×40 mm) T-slot aluminum profiles, designed for a clean and functional finish.

It engages three outer slots and the central hole, leaving one rail open for cable routing, panel access, or attaching additional hardware.

The friction-fit connection ensures a secure hold without screws or glue, and the rounded corners preserve the profile’s smooth contour for a professional appearance.

It fits most T-slot systems (Bosch, Item, OpenBuilds, Motedis, etc.), but since internal slot dimensions vary, a slight tolerance tweak (±0.1–0.2 mm) may be required in your slicer.

✅ Features

Compatible with 120×40 mm (triple 4040) T-slot profiles

Covers 3 slots + center hole, 1 open for access

Rounded corners match the extrusion’s shape

Friction-fit — no screws, tool-free install

Works as end cap or connector for wide frames

Fits most T-slot 4040 / 4080 / 12040 systems

Printable flat, no supports needed

🧰 Applications

Finishing triple 4040 (12040) frame ends

Access ports or cable pass-throughs

CNC, laser, or 3D printer frame systems

Connecting multiple 4040 profiles together

🛠 Recommended Print Settings

Material: PETG / ABS (durability), PLA (light-duty)

Layer Height: 0.2 mm

Infill: 50–100 %

Supports: Not required

Orientation: Flat on bed

📏 Compatibility

Works with most T-slot 4040 / 4080 / 12040 systems

Slight slicer tolerance adjustment ±0.1–0.2 mm

Not fully compatible with Misumi extrusions

T-Slot 12040 End Cap (Triple 4040, 3-Slot)

0.2mm layer, 2 walls, 15% infill