T-Slot Side Connector (Dual / Inline Joiner)

BOM: Printed with ROSA3D High Speed PLA Signal Violet

This is a compact side connector for T-slot aluminum profiles, designed to join two or more extrusions directly side-by-side by sliding into their adjacent rail slots.

The connector provides a tight friction-fit hold without screws, allowing fast and reversible frame expansion or reinforcement.
It’s ideal for creating wider profiles or rigid modular structures from multiple smaller sections (e.g., combining 4040 profiles to form larger assemblies).

The model is compatible with most T-slot systems — including 4040, 4080, and 12040 extrusions (Bosch, Item, OpenBuilds, Motedis, etc.).
Because internal slot tolerances may differ, you can tune the fit by ±0.1–0.2 mm in your slicer for perfect alignment.

You can also scale its Z-axis height to adjust the connector’s length — the default is 12 mm, which provides a solid and balanced hold.

✅ Features

Connects two T-slot profiles side-by-side

Works with 4040, 4080, 12040, and similar sizes

Friction-fit — no screws or tools required

Printable flat, supports not needed

Adjustable length (Z-axis) for stronger joints

Maintains smooth profile alignment

Easy to install and remove

🧰 Applications

Joining profiles edge-to-edge or creating wider sections

Frame extensions for CNC, laser, or 3D printers

Modular enclosures and gantry reinforcement

Building custom extrusion-based systems

🛠 Recommended Print Settings

Material: PETG / ABS (preferred for durability)

Layer Height: 0.2 mm

Infill: 60–100 %

Supports: None

Orientation: Flat on bed

📏 Compatibility

Works with T-slot 4040 / 4080 / 12040 systems

Slight tolerance adjustment ±0.1–0.2 mm may be required

Not ideal for Misumi extrusions