Holy Grail Project - Re-Usable Collapsible Cup from Sustainable Materials

Step 1Materials

Materials
You will require:
- Polypropylene plastic sheet, approximately 0.5mm thick. If you wish to adhere to redesign principles, I got mine from a marbig folder that had split along a seam- you can use any brand or translucent colour that has a flat section larger than 23cm x 26cm.

NOTE: It's important that the plastic is PP as it has 'living hinge' fold characteristics that allow it to be continuously bent without eventually snapping. Check the recycling code - it should have a 5 in the middle of the recycle symbol, and PP underneath it. If you can't, try going to: http://www.modernplastics.com/how_to_identify_plastics.htm
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2 comments
Aug 21, 2009. 11:45 PMeuntrepreneurintraining says:
recycle #5 polypropylene is not a foodsafe material. Better than PET? Yes. Good for you? No. Try this link for more information;
http://www.hpakids.org/holistic-health/articles/108/1/Plastic-Water-Bottles

That said, I am really impressed with your design. Good work!
Jan 23, 2009. 4:34 PMtsgreenwood says:
http://www2.eng.cam.ac.uk/~sdg/dstruct/cylinders.html is no longer a viable link. Could you provide a fresh one by any chance? Thanks!

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Author:Daniel Treacy