What I want to do
A few months ago, I taught a papercraft class at Parts & Crafts, and we went through a lot of different paper hinges, joints, and fasteners, so I tried some out on a mod of the mini foldable spectrometer (available in the store here).
Update: for detailed instructions on assembling this design with step by step photos, see this note.
My attempt and results
It's tough to figure out a glue-less fastening which is also light-tight, but one way is to have double flaps. This is clearly a work in progress, but I also widened the design so it's easier to hold, and fits our wider acetate slits, and makes a wider band of spectrum, so it's easier to get a cross section.
I also found it made it wide enough to put instructions on -- I thought perhaps build instructions could go around the cutout, and usage instructions could go on the device itself -- kind of like the instructions written on the door of the Antikythera mechanism (thinking back to the talk I gave at the Open Hardware Summit a few years ago)!
(image via Wikipedia
Here are a bunch of photos:
Questions and next steps
I think a more thorough division of instructions between construction/use as outlined above is a good next step, and further work has to be done on attempting glue-less attachments, if possible.
I'd like to see if it's possible to make it easier to print onto stiff non-black paper, and just blacken the back (by printing black ink, or painting it). This'd make it easier to reproduce.
Why I'm interested
This design's been around a while, but there's still room for improvement! It's a great onboarding opportunity too.