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Inspired by Ikeda Yosuke's open/close sign design which relies on gravity and relatively frictionless joints, I decided to design one using planetary gears to drive the movement of the letters. An animation of the transition can be seen here: https://youtu.be/TmrUlpgojlY
<i>The model has now been updated to include the "d" in closed but the video is of an older version.</i>
The gears are made to snap fit onto their respective axles, tolerances for rotational and press fit parts have been confirmed and should work well with a properly calibrated printer.
<b>Updated 24/3/17:</b>
- D in "closed" has finally been added to the design. Using the joiner.stl piece, the letter d should lay perfectly over the top of the c and the l. First glue the joiner to your gear_right in the correct position and then glue it to your letter d to allow proper alignment.
- Type has been refined a little bit, particularly on the letters e, d, c, and l.
<b>Updated 11/2/17:</b>
- Registration points added for letters to attach to gears
- Split base plate for smaller build platforms (minimum build size required 160 x 160 mm)
- Refined font to remove sharp edges
- E and S/N has been chamfered on the bottom edge to avoid catching
- Planet gears and gear_left have been heightened by 1mm in order avoid contact with the axle
- gear_left has modified gears to only allow rotation in the direction such that letters don't touch each other (idea by frankvdh)
