This parametric square washer/spacer is designed for versatility, strength, and easy customization. Whether you're spacing components, distributing load, or aligning parts in a build, this model lets you quickly generate the exact dimensions you need.

Unlike traditional round washers, the square profile provides improved surface contact and helps prevent rotation in certain applications—making it especially useful in assemblies where stability matters.

🧱 Customization Parameters

• Inner Diameter (ID): Size of the central hole
• Length: Overall size in one direction
• Width: Overall size in the perpendicular direction
• Height: Thickness of the spacer
• Fillet (vertical edges): Radius applied to vertical edges to reduce stress concentrations and improve handling
•  

📏 Metric ↔ Imperial Inner Hole Size Reference

Use this table to match common metric fasteners with approximate fractional inch equivalents. For best fit in 3D printing, add a tolerance of +0.2 to +0.4 mm depending on your printer.

Nominal Size | Hole Diameter (mm) | Inch (decimal) | Inch (fraction)
M2 | 2.2 – 2.4 mm | 0.087 – 0.094 in | ~3/32"
M2.5| 2.7 – 2.9 mm | 0.106 – 0.114 in | ~7/64"
M3 | 3.2 – 3.4 mm | 0.126 – 0.134 in | ~1/8"
M4 | 4.2 – 4.4 mm | 0.165 – 0.173 in | ~11/64"
M5 | 5.2 – 5.4 mm | 0.205 – 0.213 in | ~13/64" (~3/16")
M6 | 6.2 – 6.5 mm | 0.244 – 0.256 in | ~1/4"
M8 | 8.2 – 8.5 mm | 0.323 – 0.335 in | ~5/16"
M10 | 10.2 – 10.5 mm| 0.402 – 0.413 in | ~13/32" (~3/8")
M12 | 12.5 – 13.0 mm| 0.492 – 0.512 in | ~1/2"

🖨️ Printing Tips

• Use PLA for general use, or PETG/ABS for higher strength and heat resistance
• Print flat on the square face for best bed adhesion
• 3–4 perimeters recommended for durability
• Increase infill (≥40%) for load-bearing applications