Modular hand held arm with "Backsaver" grip attachment"

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Modular hand held arm with "Backsaver" grip attachment"
Description Preliminary design page for Modular hand held arm with "Backsaver" grip attachment and "Leaf Claws"
Keywords 3D printing, modular arm, backsaver, leaf claw, yard work, gardening
Uses development, industry, hobbyism
Authors Karan Dhankani
Status prototype
Made? Yes
Replicated? Was this project made independently by someone other than the authors and without their guidance? Yes
Countries of design United States
Estimated cost USD $ 5.00
Sustainable Development Goals SDG08 Decent work and economic growth
SDG03 Good health and well-being
Documentation data
Language English
Manifest data
Language English
Updated 2020-06-04
Author Kathy Nativi
Author affiliation Appropedia
Author email info@appropedia.org

Modular hand held arm with "Backsaver" grip attachment"[edit | edit source]

Project developed by Karan Dhankani


Abstract[edit | edit source]

With a modular setup, this device can be used as multiple tools in one. Main applications could be for people from third world countries where there is minimal automation. A shovel helper grip attachment could save a lot of effort by transferring some of the load from the user's back to the well gripped other hand. This in-turn results into lesser fatigue and more productivity.

Also, the Leaf Claws attachment can function as a big sized leaf collector hand or as even a shovel for damp yards. These type of attachments could also be used to reach certain areas (eg: for maintenance purposes in sanitation) where use of bare hands could have caused infections.

  1. Picture of completed print using
    Wood WorkingClamp Parts.png

Bill of Materials[edit | edit source]

  1. 3 bolts: 5/16 inch diameter with approx 5 cm length: 38 cents x 3 = USD 1.14
  2. 3 Nuts that fit into those bolts: 21 cents x 3 = USD 0.63
  3. Hair band / Rubber band: Free?
  4. PLA filament: Approx 50 x 3 grams = USD 3.2

The STL files and FreeCAD files for the parts can be found here:


Tools needed for fabrication of the OSAT[edit | edit source]

  1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and Knowledge Necessary to Make the OSAT[edit | edit source]

  • Knowledge of FreeCAD and Cura

Technical Specifications and Assembly Instructions[edit | edit source]

- To Assemble: -

  1. Download the part files provided above in the bill of materials
  2. Convert stl files to gcode using software like Cura
  3. Print all of the Parts
  4. Attach a hair band / rubber band with the handle arm to make it a comfortable grip on the user's wrist
  5. Connect the interlocking jaws of whichever tool you want to use
  6. Secure with nut and bolt

- Time:

  • Total print time estimate: 5 hours
  • Total assembly time estimate: 3 minutes

Common Problems and Solutions[edit | edit source]

  • One must be careful of your printer radius and calibration as a couple of those parts only just fit into my Delta: check how thw first couple of layers print and shrink the models if needed (all be same amount)
  • Sticking to the bed could be a common problem in case of such large prints: Use high quantities of washable glue on bed before printing

Cost savings[edit | edit source]

  1. Cost Estimate: USD 5 for two tools
  2. Equivalent products in market cost: USD 33 (Backsaver grip: USD 13 and Leaf claw: USD 20)
  3. Net savings achieved: USD 28

References[edit | edit source]

  • The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example: [1]
  1. web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html

[[Category:health care]] [[Category:Gardening]] [[Category:Farming]]