Customizable Peg

The Customizable Peg is a 3D printed ground spike designed to be driven into the ground to hold an object in place. It is offered in two sizes to suit different holding applications.

Device data

Design files	https://www.appropedia.org/File:GN009_Large_Eng_Dwg.zip https://www.appropedia.org/File:GN009_Small_Eng_Dwg.zip
Schematics	https://www.appropedia.org/File:GN009_Large_CAD.zip https://www.appropedia.org/File:GN009_Small_CAD.zip
Hardware license	CERN-OHL-S
Certifications	US000189 Verify

The peg is 3D printed, with material listed as ABS plastic; example pegs shown in reference images were printed in PLA using a 0.3 mm layer height, 2 shells, and 10% infill. A small, 5 gram peg size has been used to secure robot lawn mower boundary cable into grass, with a print time of approximately 15 minutes.

Levels are identified based on this reference: Field Ready Readiness Levels

Usage Notes

• Print the peg lying down (horizontally) for maximum strength.
• The design follows the "rule of 45," meaning no print support is needed at up to a 45-degree overhang angle.
• Due to limitations in the design's underlying parametric programming, certain dimension values may generate non-manifold (invalid) geometry. If this occurs, try values close to the originally intended dimension rather than the exact value, as nearby values are likely to generate a valid, printable model.

Maker Manual: 3D Printing

Open the file using slicing software and prepare for 3D printing. Use the printing settings below (settings may need adjustment depending on the specific 3D printer brand and filament manufacturer used).

Note: these settings differ from the usage notes above (0.3 mm layer / 2 shells / 10% infill, no support needed under the "rule of 45"), which appear to describe the specific example pegs shown in reference images. The table above reflects the separately provided standard print settings, at 99% infill and with a brim rather than no adhesion aid, so it's worth confirming which settings are the intended default before publishing.

About the manuals

Field Ready develops manuals to support both the fabrication and safe use of its products. A maker manual provides step-by-step instructions for replicating the design, including materials, tools, and assembly guidance, so that makers in different locations can build the product accurately and consistently. A user manual, where applicable, explains how to properly set up, use, and maintain the product once it is built, helping ensure it performs safely and as intended for the end user. Together, these manuals make the design accessible to both fabricators and the people who ultimately rely on the product.