▼This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the talk page. The course runs in the Fall semester. It is not open edit.

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. The stl files can be downloaded from here: http://www.thingiverse.com/thing:1183651

Images

• 
  Fully assembled hand held shovel grip
• 
  Example of application of Shovel Helper - Backsaver
• 
  Example of application of a Leaf Claw application - Backsaver
• 
  Modular handle arm with three fixture holes
• 
  One of the two shovel helper that fits into the modular handle arm
• 
  Leaf Claw that fits into the modular handle arm

Bill of Materials

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

Tools needed

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

Skills and knowledge needed

• Knowledge of FreeCAD and Cura

Technical Specifications and Assembly Instructions

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

Cost savings

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 (Atleast)
4. Similar products online:
   1. http://www.amazon.com/Leaf-Claws/dp/B00D910KTI/ref=sr_1_7?ie=UTF8&qid=1449613392&sr=8-7&keywords=leaf+hand
   2. http://www.amazon.com/Leaf-Claws/dp/B00D910KTI/ref=sr_1_7?ie=UTF8&qid=1449613392&sr=8-7&keywords=leaf+hand
   3. http://www.amazon.com/Stout-Backsaver-Attachment-Garden-Assorted/dp/B000DEN57S/ref=lp_128061011_1_24?s=lawn-garden&ie=UTF8&qid=1448856619&sr=1-24

References

1. www.amazon.com
2. www.walmart.com