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Many of your suggestions were considered, but I was weary of creating something overly complicated. I wanted something most people could reasonably make with standard components without having to hunt for many specific items. I had some versions of the front cover that more freely vibrated, but it did not produce any more volume and actually didn't sound as good. So in the end I went for this simple and very sturdy design.
Thanks for the tip! The thumbnail shows the speaker, but the file is re-directing to my other instructable file. Very odd. I uploaded another "everythingSpeaker.stl" file to be sure
I designed it all in TinkerCAD.com! :)
An Entirely 3D Printed SpeakerView Instructable »
The magnet is inserted into the slot right below the coil. The polarity of the magnet doesn't matter — its direction would just change the rotation of the coil.
3D Printed Electric MotorView Instructable »
Hey Mark, I have been working on the paper tape feature. It works! I will be uploading the new design. It essentially uses the tip from an expo marker. There is an adjuster so it hits the paper with enough force to leave a mark, but not enough to stop the paper.
3D Printed Telegraph Key & ...View Instructable »
A small cap, maybe 0.1 microfarads in parallel with the switch should do the trick, mostly. Can you post a picture of the completed clock? I'd love to see :)
Question: Is supplying the current from the +5V pin unwise? Isn't that a lot of current going through that one pin that could possibly destroy the Arduino's voltage regulator? Go through VIN instead?