Update to Changeable Garden Tool Heads

Interchangeable Garden Tools

Project developed by Ldstetsk - concept from project by Sierra Lunsford, Changeable Garden Tool Heads

This Open Source Appropriate Technology has been designed but not yet tested — use at your own risk.

This Open Source Appropriate Technology has been prototyped.

Abstract

A few students from previous classes created smart and creative tools that could be used anywhere in the world for many different applications. I took it upon myself to create a universal, ergonomic handle, and update two tools to interchange easily with my handle. I also uploaded a file used to create more tools that would fit with the handle, if anyone would like to add to the attachments.

Bill of Materials

1. Handle
2. Pin
3. Pruning Hook
   1. (2) Stanley Heavy Duty Utility Blades (10 for $6.14)
   2. (4) 3MM nuts and bolts
4. Cultivator Rake

Source File

YouMagine Entry

STLs on Github Repository

Tools needed for fabrication of the OSAT

• MOST Delta RepRap or similar RepRap 3-D printer
• Philips Screwdriver
• Pliers to Tighten Nuts
• Sandpaper for minor sanding to ensure perfect fits into handle

Skills and Knowledge Necessary to Make the OSAT

• Slicing Software such as Cura
• Open Source CAD software such as FreeCAD

Technical Specifications and Assembly Instructions

The following are the setting I used to print each piece. These may not be the optimal settings, but the final pieces work well

Handle - 32g filament - 2.5 hours to print

• Infill: 10%
• Layer Height: 0.2 mm
• Shell Thickness: 1.5 mm
• Bottom and Top Thickness: 1.5 mm

Pin - 2g filament - 15 minutes to print

• Infill: 10%
• Layer Height: 0.2 mm
• Shell Thickness: 1 mm
• Bottom and Top Thickness: 1 mm

Pruning Hook - Based off Hannah Power's Pruning hook - 29g filament - 2 hours to print

• Infill: 50%
• Layer Height: 0.2 mm
• Shell Thickness: 1.5 mm
• Bottom and Top Thickness: 1.5 mm

Cultivator Rake - Based off Matthew Andres' Hand cultivator - 66g filament - 5 hours to print

• Infill: 50%
• Layer Height: 0.2 mm
• Shell Thickness: 1.5 mm
• Bottom and Top Thickness: 1.5 mm

Cost savings

• $3.25 in PLA filament
• $1.50 in nuts and bolts from hardware store
• $1.23 for 2 utility blades

$4.63 Total

Commercial Equivalent

• Pruning Knife - $15.74
• Cultivator Rake - $10.71

$26.45 Total Savings = $21.82 = 82%