WiFi Eye Part 2: Assembling the Eye of Agamotto Enclosure

By Jeremy Lee

 

In part 2 of our joint project series with All About Circuits, we’ll layout the 3D parts needed for the Eye of Agomotto skin. Stay tuned for the Destiny Ghost skin in the next installment!

 

Electronics and Circuitry

The Wi-Fi Eye, Part 1: Introduction, Features, and Materials

The Wi-Fi Eye, Part 2: Firmware, Wiring, and Network Connection

The Wi-Fi Eye, Part 3: Choosing the Right Servos for the Job

The Wi-Fi Eye, Part 4: Power System and Neopixel Lights

 

3D Printing and Construction

WiFi Eye of Agamotto 3D Printing and Assembly

WiFi Eye Part 2: Assembling the Eye of Agamotto Enclosure

WiFi Eye Part 3: 3D Printing the Destiny Ghost Skin

 

3D Printed Parts

You can find all of the files for these parts on Thingverse.

Eye Lid

You’ll need two of these for the eyelids. Print without supports (yes, really) and clean up with a sharp blade. The servo horn ‘socket’ will come out a bit saggy, but the outline should be there and you can shape it to fit your horns exactly.

 

 

Eye Core

This is the carrier that holds the servos so the eyelids can fit over the top of the neopixel on the central pedestal. The little arrow-like flanges on the end are for zip-ties to loop over.

 

 

Middle Plate

This holds all the other electronic components. By making it a “shelf” sitting off the side of the core, it’s kept aesthetically thin around the edges. Depending on how the amulet prints, there may be a gap – stretch Z a few percent if you need to.

 

 

Amulet

The part everyone sees; structurally it’s just a “faceplate” over the core. This must be printed with supports, as the back has several ‘pockets’ for the components where we don’t care about aesthetics.

 

 

Crossbeams

 

This clearly needs to be printed with supports, and some care is taken when removing them. Don’t lay it “flat” on the build plate; the provided angle means the surface texture matches with the ‘grain’ of the amulet.

 

 

Assembly Diagram

 

 

Glue the neopixel onto its pedestal in the center of the core, and run its wires out through the slot beside it. Make sure they’re secured down against the plastic so the wires can’t foul up the eyelid when it opens.

Glue some servo horns into the “sockets” on the outside of the eyelids. Try to get them as axially straight as possible. I cut down the “cross” horn to just a single arm since it was shortest.

Screw the servos into their horns, and drop them into the core. The two eyelids should interlock nicely but still rotate freely.

Most of the electronics wiring can be done at this point. Add the “middle deck” to hold the ESP and voltage regulator boards.

The amulet and crossbeams are glued together (with a few dabs of CA glue where they touch, held down by a weight) and then painted. The visible parts of the eyelid are also painted – just avoid the surfaces where they mesh (the servo horn rings and dead-center bumps) or they might stick together.

There are four channels for zip-ties on the back of the amulet. Hopefully the slots print obstruction-free, otherwise, they’re a devil to clear out. (A design flaw on my part, probably) Two zip-ties secure the arrow-like ends of the core, also threading through the middle plate, to the amulet face. Two more hold the battery within as much of an indent as I could create.

 

Extra Parts

Woggle

Two of these are used where the cord attaches to the amulet, they are good for covering knots and generally keeping it tidy.

 

 

Holder Stand

A nice presentation stand. A support wall is built-in (so print without extra supports) and is intended to be removed with side-cutters so that any roughness just enhances the “feather” effect, as long as you’re fairly clean around the base.

 

 

I used a couple of brown shoelaces for the necklace cord, which tie through the loops at the tops of the amulet. Then I slipped the “woggles” down to cover the knots and make it look like the movie prop.

The holder stand I’m actually quite proud of, given how conceptually simple the design was. The “feathers” are flattened spheres cloned along a mathematical curve by a program loop in OpenSCAD. It’s basically one line of code. The stand is guaranteed to precisely hold the Eye because the final amulet shape was subtracted from it.

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