This is a universal-fit end cap for 4040 T-slot aluminum profiles, designed to engage three slots and the central hole while leaving one slot open for cable routing or accessory mounting.

The cap provides a secure friction-fit connection without the need for screws or glue, and includes rounded outer corners to match the extrusion’s contour and maintain a clean, professional appearance.

It’s compatible with most T-slot 4040 systems (Bosch, Item, Motedis, OpenBuilds, etc.).
Since internal dimensions vary slightly between brands, you may need to fine-tune tolerances (±0.1–0.2 mm) in your slicer for the perfect fit.

✅ Features

Fits most 4040 T-slot profiles

Engages 3 slots and center hole – 1 side open for access

Rounded corner design for an OEM-like finish

Friction-fit connection, tool-free installation

Can be adjusted slightly for tolerance differences

Protects ends while keeping one rail functional

🧰 Applications

Frames requiring access to one open slot

Machine and printer builds

Enclosure corners or rail terminations

Cable management and accessory mounts

🛠 Recommended Print Settings

Material: PETG / ABS for durability, PLA for decorative use

Layer Height: 0.2 mm

Infill: 50–100 %

Supports: Not required

Orientation: Flat on bed

📏 Compatibility

Compatible with most T-slot 4040 extrusions (Bosch, Item, Motedis, OpenBuilds)

Tolerance adjustable ±0.1–0.2 mm for perfect fit

Not fully compatible with Misumi 4040