First, you will need a green laser anything 125 mW and above.You also need a diffractive glass that will distribute the green laser beams.You could probably use those cheap diffractive glasses from 3D glasses too.
Second, you will need a plastic epoxy
Third, you need bunch of pipesYou need to drill a hole in the center of the diffractive glass, then epoxy it to the motor. Now, I accidently broke the glass and had to epoxy everything. Just make sure to use a real thin drill and go slow so you don’t make the same mistakes that I did. Then, also epoxy the bottom end of the motor to the 90 degree pipe arm. (Make sure to solder on 2 wires to the motor!).
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Build your green laser projector using the pipes and pipe parts sorta like below. Put all the wires through the pipes so it comes out the other end. (Sorry again, I forgot to take pictures of this step.) Then assemble everything. You can fit the green laser through the T-pipe piece. (For the T-pipe piece, I used a bigger size then used electrical tape around the pipes to stabilize it.)
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