Bottom on Base.jpg
Device data
Manufacturing files
Hardware license CERN-OHL-S
Certifications Start OSHWA certification
Project data
Authors John Wyrzykowski
Completed 2019
Made? Yes
Replicated? No
Cost USD 1.7
Instance of Menstrual tracker
OKH Manifest Open Know-How Manifest Download
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This project is a desktop menstrual cycle tracker, that one simply uses by moving the pointer as each day passes. In many countries and cultures, contraceptives are expensive and frowned upon, even with married couples. Couples in poverty struggle with having too many children, nevertheless. A method for preventing pregnancy without use of conventional contraceptives is by having sex at the correct time in a menstrual cycle to minimize the chance of a birth. This device cheaply allows women to track their cycle easily, and can also be used when a couple is having trouble having kids. Women having a good awareness of their cycles is also crucial to maintaining their health.

Find more information on a similar idea here: [1]

Bill of Materials[edit | edit source]

  1. BOM: Bottom(1), Base (1), Pointer(1), Small Attracting Magnets(optional) (2)
    1. See source information on Thingiverse: [2]

Tools needed[edit | edit source]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Super Glue
  3. 3 Different Color Paints (Preferably Green, Red and Brown)

Skills and knowledge needed[edit | edit source]

  • No special skills required!

Technical Specifications and Assembly Instructions[edit | edit source]

  1. Print time: ~3 Hours
  2. Assembly time ~15 mins
  3. Center the Bottom underneath the Base, and super glue into place.
Bottom on Base.jpg
  1. Flip assembly over, then glue or use existing adhesive to attach magnet half into the center of Bottom, such that it is in the center hole.
Magnet on base.jpg
  1. Glue or use existing adhesive to attach magnet half into the bottom of the Pointer.
Magnet in pointer.jpg
  1. Paint the top of Base as shown in the picture. On this model:
Painted bottom base.jpg
    1. Green means that the chance of getting pregnant is high.
    2. Brown means that there is a low chance of getting pregnant.
    3. The yellow line is the marker for 26 days, and can be used as a reference for is the user's period has occurred early.
    4. The red line signifies the start of the user's period.
  1. Place the pointer in the hole as shown, and advance a notch clockwise as each day goes by!
Completed cycle tracker.jpg

Common Problems and Solutions[edit | edit source]

  • Make sure you advance the tracker clockwise!
  • Sand the parts as necessary to make the movement smoother.

Cost savings[edit | edit source]

  1. Total filament usage: 35g = ~$0.70
  2. Magnets: $1.00 at Hardware Store

Commercial equivalent: $29 [3] $28.30 savings and 97.5% savings

Benefited Internet Communities[edit | edit source]

  1. [4]
  2. Planned Parenthood [5]
  3. U.S. Department of Health and Human Services [6]
  4. Office on Women's Health [7]
  5. WebMD [8]

== References ==[1]

Page data
Type Device, Project
Keywords 3d printing, menstrual cycle tracker, menstruation, osat, glue, paint, plastic, osat 3d-printable designs
SDG Sustainable Development Goal SDG03 Good health and well-being, SDG05 Gender equality
Published 2019
License CC-BY-SA-3.0
Affiliations Michigan_Tech's_Open_Sustainability_Technology_Lab, MY4777, MTU
Language English (en)
Impact Number of views to this page and its redirects. Updated once a month. Views by admins and bots are not counted. Multiple views during the same session are counted as one. 111
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