Easy Spectroscope

Build a simple DIY spectroscope with an old CD, an empty paper towel roll, and a 3D printer. Print the two different end caps, glue or tape the diffraction grating (part of an old CD with the metallic top layer removed) into the cap with the larger hole, and place both caps on the end of the paper towel roll. Look through the end with the larger hole and the CD diffraction grating at different light sources to see their spectra.

#Tips
- It might be tempting, but please don't look directly at the sun, even through the spectroscope.
- Pick a CD you don't want anymore ;)
- Use sharp scissors to cut out a portion of an old CD.
- Tape (like duct tape) can help peel off the top metallic layer from the CD. Just stick the tape to the top surface and peel up.
- The radial direction of the CD (the direction from the center of the CD to the edge) should be oriented parallel to the long dimension of the filter hole.
- The two end caps should be rotated so that the two rectangles are perpe