A couple of weeks ago i bought a el-cheapo laser pen. It was cool until it broke the day after I got it. So I decided i would hack it and put it in a LEGO brick...
WARNING: Never shine any laser pointer in your eyes!
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Step 1: Gather Materials
1. laser pointer or laser pen
2. 2x6 LEGO brick ( or whatever fits your laser assembly )
3. short length of wire
4. batteries that came with the laser
1. soldering iron
3. something to gut LEGO brick
4. something to put a hole in LEGO brick