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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.

Carpenter's Hammer - 16 ounce[edit]

Created by Connor Kmiec

This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.
This OSAT has been modeled.
This OSAT has been verified by: Connor Kmiec.


  1. This OSAT project is a carpenter's hammer. In order to be heavy enough and duable enough to drive nails, a bolt is used for the hammering surface. The resulting product is a very strong hammer that can drive and remove nails. This hammer is an appropriate OSAT because a hammer is one of the most basic and necessary tools to build a structure. A hammer like this would be easy to print, low cost, and fill a real need for a developing area.
  2. The completed carpenter's hammer can be seen on the right
    Hammer iso.jpg
  3. Link to Thingiverse page where customization can be done to the tool:

Bill of Materials[edit]

CAD Files


Extra Parts

  • 3/4" x 3.5" bolt

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. 1/18" wrench for bolt installation.

Skills and Knowledge Necessary to Make the OSAT[edit]

  • There is no special skills needed to make this tool.

Technical Specifications and Assembly Instructions[edit]

  1. If any changes to the design want to be done, open the SCAD file and adjust the parameters.
  2. Slicing instructions
    1. Fill % = 100 (Less infill could probably be used)
    2. Speed = 50 mm/sec
    3. Layer Height = .15 mm
    4. No support Needed
    5. I recommend using a brim on the print
    6. Print the hammer standing up, hammer head end down
  3. Print time with above settings will be about 15 Hours
  4. Tread bolt into hammer with a wrench after printing.
Demoing Hammer Use

Common Problems and Solutions[edit]

Bolt can be difficult to thread into the hammer, I used a vise to hold the hammer stationary.

Cost savings[edit]

Cost of creating this hammer

  *Filament needed: 235 grams @ $18.39/kg = $4.32
  *Hardware needed: 1 bolt @ $0.91
  *At a total cost of $5.23

Commercial Equivalents

  *Equivalents range from $9.97 ([1]) to $199.97 ([2])

Saving amount

  *The savings are anywhere from $4.74 to $194.74
  *The percentage saved ranges from 47.5% to 97.4%


Hand Cultivator
Hammer 1  
Hammer 2  
Hammer 3