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What are you using to close the reed switch? Usually a magnet is used. Did you leave this out or is there another way to activate the switch?
Don't use a Phillips (cross) head screw in the first place. Use a square socket (Robertson in Canada) or Torx head screw.
Good instructable. I tried to use this BT module but found it very difficult to solder the wires on to it. Here is a link to another BT module . Just remove the plastic case. Worked great for me.http://www.benl.ebay.be/itm/3-5mm-USB-Bluetooth-Wireless-Audio-Music-Speaker-Receiver-Adapter-Dongle-Hotsale-/181886085155?hash=item2a59416823:g:cogAAOxyNo9SynA3
Are you sure of those box dimensions? Might they be 50mm x 50mm x 20mm?
some lizards eat them
Borax works on their insides. It is insoluble in their gut and the crystals slice up their gut, painful but effective.
You could probably buy a plastic project box and modify it (cut out a slot for the switch lever) that would as well as the 3D printed one.
At mark 1:00 you state "that is what makes a parallel circuit", after saying the electrons flow through one LED and then the next. Perhaps you want to edit this. A good explanation otherwise.
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