Rigid Coupler (5 variants)

📦 Contents:This set includes 5 different versions of rotary motion transfer/mounting components, designed for shafts and an M4 locking screw.Each model features a dedicated hole allowing direct thread cutting with an M4 screw — no inserts or nuts required. ⚙️ Common Features:Height of all models: 30 mmHole for M4 screw with self-threading tolerance – ⌀3.2 mmAssembly clearance: +0.1 mm (optimized for FDM 3D printing) Available variants:5x5 mm5x8 mm6x8 mm6.35x8 mm8x8 mm 🧩 Applications:DIY roboticsGearboxes and drive systems in RC modelsShaft-to-wheel, pulley, or joint connectorsPrototyping and engineering projects 🖨️ Printing Recommendations:Wall lines: 4Material: PLA / PETG / ABSLayer height: 0.2 mmInfill: ≥ 30%No supports needed (all models are support-free) 📝 Notes:After printing, screw the M4 bolt directly into the hole – PLA and PETG hold threads well.If needed, lightly sand shaft holes for a perfect fit.Models can be scaled in the Z-axis for custom heights.Designed for manual a