Bricklayer’s Line Kit 3mm improved string gaps

3D Printable Bricklayer's Block Line Blocks (Upgraded)

This is a rugged, site-tested pair of line blocks designed for professional bricklayers and builders. Unlike cheap, brittle alternatives, this model is built to survive the daily abuse of a busy construction site.

What’s New in This Version?

• 3mm String Gaps: Back by popular demand! Based on feedback from builders who struggled with tight, fiddly slots, I’ve widened the string gaps to 3mm. This makes wrapping and securing the line fast and easy, even if you have thick fingers or you're wearing heavy work gloves.

Proven on Real Sites

This isn't just a theoretical design cooked up at a desk. I co-developed and refined this tool in conjunction with my son, who is a professional bricklayer. He uses these exact blocks on-site every single day. They are fast to deploy, hold the line perfectly taut, and are strong enough to withstand being tossed into a tool bag at the end of the day.

Why Print This?

• Professional Quality: Designed to compete with premium tools, not cheap imports.

• Tested & Approved: Proven to handle the speed and demands of a live commercial building site.

• 100% Free: I’m sharing this file completely free of charge to support the building and making community. Download it, print it, and spread the love!

Recommended Print Settings

• Material: PETG, ABS, or ASA (for impact resistance and UV durability under the sun). Avoid standard PLA as it can be too brittle for site use.

• Infill: 40% – 50% (Gyroid or Grid for structural strength).

• Walls/Perimeters: 4 or 5 lines to ensure the corners and line slots don't shear under tension.