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

Step 7The Seam

The Seam
I'll be frank with you, this part of the project took a long time to get right and it's pretty frustrating, so if you're trying to do this at home, you may have to persevere with it. This is one part of the project I hope to refine soon, so any comments are appreciated.

With your soldering iron in hand, try to pinch the cylinder so the edges of the seam align. Do this for ONE panel at a time, or it'll be pretty much impossible to line up. Using the chisel tip of the iron, run it down the touching edges to fuse them together. This essentially becomes just another fold line. Do this all the way down, and the cylinder should end up with a spiral, zigzagging seam that acts as just another mountain fold line. Now to add the top and bottom...
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Author:Daniel Treacy