This dual-height reinforced internal corner connector is designed for 40×40 T-slot aluminum extrusion profiles, ideal for building 8040-style frames or double-layer structures.
It allows two profiles to be joined perpendicularly from the inside, providing excellent rigidity while keeping the exterior clean and flush.

Features:

🧱 Dual-height body — fits two stacked 4040 profiles (or one 8040 extrusion)

🔩 Friction-fit design — secure hold without screws, yet removable

⚙ Reinforced geometry for maximum strength in load-bearing frames

🖨 No supports required, prints flat on the bed

🔧 Works with most 4040/8040 T-slot standards (Bosch, Item, Motedis, OpenBuilds, etc.)

For best results, fine-tune printer or model tolerances by ±0.1–0.2 mm depending on your extrusion brand.