This is a reinforced internal 90° connector for 2040 (or 4020) V-slot aluminum extrusion profiles, designed for vertical frame connections.
It fits snugly inside two intersecting profiles, joining them at a perfect right angle with a secure snap-fit / friction-fit hold.

This version is taller (40 mm) and more robust, offering excellent rigidity for load-bearing corners, printer frames, and machine structures.
Ideal wherever you need a clean internal joint with maximum strength and alignment accuracy.

✅ Features

Designed for V-slot / OpenBuilds 2040 or 4020 profiles

Reinforced internal structure for high strength

Snap-fit / friction-fit — no screws required

Creates a clean, internal 90° corner joint

Taller design for double-profile height (40 mm)

Printable flat, no supports needed

🧰 Applications

3D printer and CNC machine frames

Enclosures and vertical structures

Modular systems and corner reinforcement

Robotics and heavy-duty builds

🛠 Recommended Print Settings

Material: PETG / ABS (preferred), PLA for prototypes

Layer Height: 0.2 mm

Infill: 60–100 %

Supports: Not required

Orientation: Flat on bed

📏 Compatibility

V-slot / OpenBuilds 2040 or 4020

Works with standard 20×40 T-slot extrusions