# Paragraph description of the OSAT - why is it Appropriate? What need does it fulfil? Are there case studies you have found of a technology being used successfully?
# OSAT is technology that can be used to help advance third-world countries, but in ways that makes the most sense to those areas. For starters, the type of technology is best when is relatively sustainable. Furthermore, it is also extremely helpful when the technology runs off of parts and materials that can be developed locally and does not require large purchases. These things help prevent an area from becoming self-sustainable. 3D printers are working to be a huge contribution to OSAT. Some printers, like the JellyBox, have open source designs and can use open source files to print very useful objects. This project was my design of one the objects that can be printed. In particular, I decided to design a protractor with a spirit level. First, this will be useful in education, where protractors can be used to help teach geometric concepts. Additionally, they can be used in construction to make sure angle measurements are made accurately. Both of these purposes could be quite useful to a growing country.
# Picture of completed print using [[Image:Wood_WorkingClamp_Parts.png|200px|right]]
# Picture of completed print: [[Image:protractor.png|200px|right]]
OSAT is technology that can be used to help advance third-world countries, but in ways that makes the most sense to those areas. For starters, the type of technology is best when is relatively sustainable. Furthermore, it is also extremely helpful when the technology runs off of parts and materials that can be developed locally and does not require large purchases. These things help prevent an area from becoming self-sustainable. 3D printers are working to be a huge contribution to OSAT. Some printers, like the JellyBox, have open source designs and can use open source files to print very useful objects. This project was my design of one the objects that can be printed. In particular, I decided to design a protractor with a spirit level. First, this will be useful in education, where protractors can be used to help teach geometric concepts. Additionally, they can be used in construction to make sure angle measurements are made accurately. Both of these purposes could be quite useful to a growing country.
Some kind of 'snippers' that can cut through a straw or other thin plastic.
A rolled-up piece of paper that can be used as a funnel
Skills and Knowledge Necessary to Make the OSAT
The default model perfectly fits the straw from a Silk Almond milk box, which is about 2 mm smaller than the average straw. To change the radius of the straw holder, you must change the value of the variable 'levelradius' in the .scad file. You must then export this into a new .stl file.
Technical Specifications and Assembly Instructions
Print the .stl file. This should take about 2 hours and 45 minutes.
Use the 'snippers' to cut off the circles at the corners of the protractor.
Fit a straw through both ends of the straw holder.
Use the 'snippers' to cut the straw even with the outside edges of the holders.
Use 1 piece of gum or other sealing material to seal one end of the straw.
Use a piece of paper as a funnel to pour rubbing alcohol into the open end of the straw. Do not completely fill the straw. Leave roughly an eighth of the straw's volume unfilled.
Assembly should take roughly 10 minutes.
Common Problems and Solutions
If the straw holder is not a good fit for your straw, adjust it in the .scad file using the instructions given in the 'Skills and Knowledge' section.
Cost savings
The total estimated cost of this protractor is $0.50
Commercial equivalents sell protractors and spirit levels separately, for a total of about $7.50 on the cheap end.
Printing one of my protractor/spirit levels saves about $7, which yields about 93.3% savings.
References
The following page was the inspiration/motivation for this project:
