Lightweight Wrenches
Project developed by Jackie Mayrose
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Abstract
- 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?
- Picture of completed print using
Bill of Materials
- Based on printer capabilities, cost, availability.
- Parts shown printed in PLA. ABS is probably best.
2. [broken Thingiverse OpenSCAD files]
- Editable OpenSCAD file for making different size wrenches
- Common sizes of wrench also in STL
Tools needed for fabrication of the OSAT
- MOST Delta RepRap or similar RepRap 3-D printer
- Utility/hobby knife or similar (small saw)
- Pliers optional but helpful
Skills and Knowledge Necessary to Make the OSAT
- If you used special skill – link to relevant wikipedia or wikiversity articles/courses
Technical Specifications and Assembly Instructions
- Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
Time Estimates
- Varies based on wrench size
- 13mm wrench ~1.5 hours printing plus ~20 minutes assembly
- 3mm wrench 10 minutes printing plus ~15 minutes assembly
Printing
- Slicing program - load model, lay flat
- With support, touching buildplate
- Wall thickness, top/bottom thickness ~1mm
- Fill at least 10%
Finishing
- Remove support on box end with knife/pliers/etc.
- Smooth underside of wrench if necessary
- Including drawings or pictures of the device at stage of assembly at minimum. (http://www.appropedia.org/Special:Upload)
Common Problems and Solutions
- Box end not proper size (ie round inside, not hexagonal)
- Increase print quality
- Thinner layers
- Slower print speed
- Change extrusion rate
- Not sticking to print bed
- Clean bed and reapply glue (PLA) or solvent mix (ABS)
- Support hard to remove
- Pliers useful for ripping off support
- Should not negatively affect usability
- Clean up with sharp knife
Cost savings
- Commercial 22-piece combination wrench set: 28.99 USD
- ~1.30 USD per wrench
- 13mm PLA wrench ~8g
- 3mm PLA wrench ~2g
- PLA ~30 USD/kg
- ~0.30 USD per wrench (depending on size)
- 1 USD per wrench saved on average
- 77% cost savings in PLA
- Same approximate savings in ABS given ~35 USD/kg
References
- The sources of information (e.g. engineering handbooks, journal articles, government documents, webpages, books, magazine articles etc.). References should use the <ref> </ref> and <references/> tags and can be in any format but should include all the information necessary for someone else to find the same information you did. For example: [1]
- ↑ web page: Department of Energy (DOE) Landscaping and Energy Efficiency, DOE/GO-10095 (1995) Available: http://www.eren.doe.gov/erec/factsheets/landscape.html
Based on the developmental needs addressed (e.g. food, heat, electricity, clean water, health care, etc.) be sure to label your device in the proper categories e.g. use [[Category:Water]]. Be sure to categorize your device so that it will be easy to find – for example “Low voltage connection basics” is categorized in