This model set includes three 3D-printable nut inserts designed for 40×40 T-slot aluminum extrusion profiles.
Each insert provides a clean, reliable way to mount M3, M4, or M5 nuts directly into the profile’s groove, allowing secure bolt fastening without metal T-nuts or custom hardware.

Features:

• 🔩 Three versions: M3 / M4 / M5 (included in one download)
• ⚙️ Friction-fit design — holds firmly in place but slides easily for alignment
• 🧱 Optimized geometry for most common T-slot 4040 systems (Bosch, Item, Motedis, etc.)
• 🖨️ Fully printable flat — no supports required
• 🔧 Perfect for modular frames, CNCs, 3D printers, enclosures, and robotics projects

Depending on your extrusion brand or printer tolerance, you may fine-tune fit by ±0.1 mm for the best result.
A small amount of sanding or light lubrication may help for tighter profiles.