Version 4.0 of the Public Lab smartphone spectrometer. This spectrometer is a scientific tool that straps onto an Android or iOS phone, tablet, or any camera capable of focusing very close (macro-mode) and allows you to collect spectra. Why would you want one? You can use it to identify the elemental composition of things (light bulbs, olive oil, beer, etc) based on the colors of light they emit. You can even use it to monitor your home brewing progress (http://bit.ly/Xyor6B).
This is a HUGE upgrade from the previous versions. The wall are thicker, it has a tripod mount, and the entrance slit can accommodate clip-on accessories. We originally started making these changes to optimize the model for injection molding but they work great for 3D printing as well.
You can order one on Shapeways (http://shpws.me/oHcZ), and there is also a papercraft version available here: http://store.publiclab.org/products/foldable-mini-spectrometer
CAUTION: Portions of this model were optimized for injection molding so this is definitely a difficult print to get right. Make sure your printer is tuned well before starting.
Assembly is much easier than earlier models.
- Print the three parts (the base and two body pieces, basically all the STLs)
- Attach a film grating to the upper side of the base (double-sided tape works well)
- Either screw the two body pieces together or glue them if you want a permanent bond. Attach the base using four screws.
- Mount it to your phone
- Use spectralworkbench.org to calibrate, save, and share your spectra. (If you use an iDevice then the opera browser seems to work best)
If you use an extrusion printer such as a Mendel you will probably need to print with support if you want the text to show up. If anybody wants a version without the text, let me know and I will post it as soon as I am able. Also, make sure you have your printer tuned up to print bridges and overhangs very well, because this thing is basically one huge overhang. I have successfully printed it on a MendelMax.
All parts have been NetFabbed and verified.
This is the grating I have used for the prototype. It is the linear style with 1000lines per mm: tinyurl.com/9tjrz8r . You can also use the film off of a CD, DVD, or BluRay as seen here: publiclaboratory.org/tool/spectrometer