This is a universal-fit end cap for triple 4040 (120×40 mm) T-slot aluminum profiles, designed to protect and finish profile ends while maintaining a clean, professional look.

It securely engages all 4 outer slots and the central hole with a solid friction-fit connection — no screws or glue required.

The cap’s rounded outer corners match the extrusion’s contour, ensuring a seamless aesthetic finish that also works perfectly as a flat connector for three 4040 profiles arranged side by side.

The model is designed to fit most T-slot systems (Bosch, Item, OpenBuilds, Motedis, etc.), but internal tolerances can vary slightly — you may need to adjust by ±0.1–0.2 mm for a perfect fit.

✅ Features

Compatible with T-slot 12040 (triple 4040) extrusions

Friction-fit mount — no screws required

Rounded corners for OEM-style appearance

Fully engages 4 slots + center hole

Can be used as an end cap or flat connector

Printable flat on bed, no supports needed

Tolerance-friendly design for most systems

🧰 Applications

End protection for 12040 or triple 4040 profiles

Wide-frame assemblies or gantry builds

CNC, laser, and 3D printer frame systems

Clean frame finishing or structural extensions

🛠 Recommended Print Settings

Material: PETG / ABS for strength, PLA for light-duty

Layer Height: 0.2 mm

Infill: 50–100 %

Supports: Not required

Orientation: Flat on bed

📏 Compatibility

Fits most T-slot 4040 / 4080 / 12040 systems

Works as a triple 4040 connector plate

Tolerance adjustment: ±0.1–0.2 mm if needed

Not fully compatible with Misumi extrusions

T-Slot 12040 End Cap (Triple 4040, Universal Fit)

0.2mm layer, 2 walls, 15% infill