Here's a video of how this thing works
Here's the description of this thing on my website
I designed this ring box with SolidWorks and printed the parts with a Prusa i3 MK2S. For the wood-like parts, I used Gizmodorks woodfill PLA filament, and for everything else, I used Solutech green PLA filament. To get a more authentic wood look, I just used some indoor furniture wood stain.
I provided assembly instructions below. Also, you will need the following hardware:
- 8mm aluminum rod, ~53mm long
- Three pcs. 8mm aluminum rod, 8mm long
- Four pcs. 1/8" aluminum rod, ~0.3" long
- Four pcs. roller bearings, OD 9.525, ID 3.175, W 3.969. These are available on MSC.
- Three pcs. #8 machine screws and nuts
Good luck, and let me know if it works.
EDIT on 16:54 EST,10/23/2018: Added missing file "elevator slots.STL".
Step 1: Glue the "elevator slots" to the "blade actuator" in the manner shown. Make sure the small holes on both parts line up as closely as possible. I recommend Loctite® professional liquid superglue for prints that use PLA
Step 2: Glue the 8mm diameter by 53mm long aluminum rod to the center of the "rail" part. Make sure the end surface of the rod is flush with the bottom surface of the "rail", but NOT EXTENDING PAST IT.
Step 3: Press-fit the "rail" assembly in the depression at the bottom of the "body". You need to be able to rotate the "rail" assembly a bit in a future step, so don't glue it down yet.
Step 4: Insert the three 8mm x 8mm long aluminum pins into the holes on the "elevator". If press-fitting is not tight enough, use an adhesive. Similarly, insert the four 1/8" x 0.3" long aluminum pins into the holes on the "elevator", and slide the four bearings onto the four aluminum pins. Use adhesives if necessary.
Step 5: Force the "elevator" assembly into the "blade actuator" assembly as shown in the picture. You will need to bend the "elevator slots" to make this work.
Step 6: Lower the "elevator" assembly onto the 8mm rod on the "rail" assembly until the blade actuator is resting on the surface of the main "body". Rotate the "rail" assembly in such a way that the full travel of the pad on the "blade actuator" is constrained by the bolt protrusions on the main "body". This is shown and labeled on the provided picture. Once you are certain everything is in the right place, glue or press-fit the "rails" assembly in place.
Step 7: Place the "blades" on the "blade actuator" as shown. Make sure the approximate positions of the "blades" and the "blade actuator" roughly match the picture.
Step 8: Place the "stator cover" on top of the main "body" such that the pins on top of the "blades" slide into the slots in the "stator cover". You will likely need to coax the pins into the slots with a pair of tweezers, or any sort of tool that works for you. It helps to hold down or even bolt down the "stator cover" while coaxing the pins into the slots.
Step 9: If you haven't done so already, bolt the "stator cover" to the "body" with three #8 screws/nuts. If you are certain that everything is in the right place, glue the "rail brackets" yo the top of the "rails" as shown.