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Bow and Hand Drill Set

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MOST Delta filament as guide.JPG 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 discussion tab. The course runs in the Fall semester. It is not open edit.

Preliminary Student Design Warning
Note that this page is a preliminary student design and has not been vetted.
Care should be taken to read critically and weigh the evidence.
Remember non-tested and vetted designs should not be relied on, especially in matters of health and safety. Recommendations to improve this project follow:

  • as printed not practical
  • not clear PLA can handle this application
  • worse than natural materials
  • sub-optimal curves on upper design
  • no ergonomics

Bow and Hand Drill Set[edit]

Project developed by Joe Vieau [[[User:Jcvieau|Jcvieau]] (talk) 06:58, 6 December 2016 (PST)]
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.

You can help Appropedia by contributing to the next step in this OSAT's status.


Fire is a crucial element when surviving in the wilderness. It is a source of light, warmth, protection and give one the ability to prepare food or sanitize water. Most people take for granted these elementary necessities in their average day life. The Bow and hand drill set will provide the ability of a knowledgeable individual to create fire with relative ease. For ages the bow drill has produced fire for the avid rustic outdoors men, the misplace camper and the indigenous. The simple design has withstood the test of time and is now commercially sold. The premise of the success of the bow drill is based the three elements that are needed to create fire; a fuel source, oxygen and heat. The fuel source is the selected wood, accustom to the region of the world the user inhabits, the oxygen is supplied by the atmospheric conditions and the heat is generated by the friction between the two pieces of wood.

DISCLAIMER:This is a model prototype. The Bow component is undersized due to the capacity of the printer used.


Bill of Materials[edit]

  • PLA - Price: Varies ($25) - Source: Amazon
  • Paracord - Price: 5.99 - Source: Amazon
    - Alternative: Shoelaces, Rope, Wire
  • Wood - Price: Varies (Free) - Source: Tree

  • CAD/OpenScad File can be found at [1]

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Optional: Knife

Skills and Knowledge Necessary to Make the OSAT[edit]

  • 3D Modeling
  • Basic Coding
  • 3D Printing

Technical Specifications and Assembly Instructions[edit]

  1. Generate/Download 3D models
  2. Save STL files
  3. Print STL on 3D printer; BOW ~3.5 hours and Hand Guard ~3 hours
  4. Tie desired string to one end of the Bow
  5. Acquire two pieces of wood; One flat and one cylindercal
  6. Wrap 2-4 loops around cylindercal wood piece and tie string to opposite end of Bow; The string should tight enough to allow the cylinderical piece of wood to rotate
  7. Place cylinderical wood piece onto flat wood piece
  8. Place Hand Guard atop the cylinderical wood piece
  9. Apply downward force with Hand Guard while moving the Bow back and forth in the horizontal direction
  10. Continue untill smoke is produced

Common Problems and Solutions[edit]

  • Apply healthy amount of adhesive to glass to prevent the print from "curling"
  • Use appropriate setting to eliminate hot end clogging, resulting in poor prints
  • If string snaps, reduce tension

Cost savings[edit]

  • ~$2.95 (Bow and Hand Guard)
  • $5.99 (Paracord)
  • $0.00 (Wood)
  • Total $8.93
  • $35.21 Primitive Bow Drill Kit [2]
  • $ SAVINGS: $26.28
  • % SAVINGS: 74.64

References[edit] [3]