Egg-O-Matic – Hand Crank & Motorized Egg Decorator

🐰 Egg-O-Matic – Hand Crank & Motorized Egg Decorator

🎉 Spin • Draw • Decorate your Easter Eggs!

Meet the Egg-O-Matic — a fun, kid-friendly machine that spins your eggs for smooth, consistent decorating. Create perfect lines, spirals, and patterns whether you use the hand crank or the USB-powered motor.

Designed to be easy to print, assemble, and use — with minimal hardware and no AMS required.

✨ Features

• 🖐️ Hand Crank Mode – interactive and fun for kids
• ⚡ Motorized Mode (USB powered) – smooth, consistent rotation
• 🥚 Works with real or fake eggs
• ⚙️ Smooth rotation using TPU tires + 608 bearings
• 🧩 Modular design with mostly press-fit assembly
• 🎨 Multi-color bunny details (no AMS required)
• 🛡️ TPU tires act as a built-in slip clutch to protect gears

🧩 Print Profiles

🔹 Common (Used for BOTH versions)

• Cage (includes motor mount)
• Gears, wheels, spacers
• Tires (TPU recommended)
• Optional printed 608 bearings
• Optional bearing caps
• Bunny parts:
  • Ears, feet, head
  • Face inserts (color parts)
  • Eyes + reflections
  • Whiskers and lips
• Top egg cradle (2 pieces – glue together)
• Bottom plate

🖐️ Hand Crank Profile

• Hand crank
• Crank shaft
• Retainer ring
• Knob (requires M3 x 30mm screw)
• Body (with crank hole, no USB opening)

⚡ Motorized Profile

• Direct drive crank shaft (motor coupling)
• Body (USB cable exit, no crank hole)

🔩 Hardware Required

• M3x6 2 screws (up to ~12mm for bottom plate)
• M3x6 2 screws for cage to bottom attachment
• M3 x 30mm screw (for crank knob)

Bearings (choose one)

• Print your own 608 bearings (see common print profile)
• Or use real ones:
  → Micro Steel Deep Groove Ball Bearings (608ZZ)
• 5 bearings total

⚡ Motor (Motorized Version)

• TT Motor DC5V 59RPM CCW Single Axis (Part # LA001 order from maker supply, or from amazon)
• Powered via standard USB-A

Optional:

• USB extension cable
• USB battery pack for portable use

🧪 Materials & Print Notes

• PLA for most parts
• TPU for tires (recommended for grip + slip)
• No AMS required — color parts are separate inserts

🛠️ Assembly Notes

• Most parts are press-fit
• Glue required for:
  • Top egg cradle (2 pieces → glue together)
  • Optional: cradle to body
  • Decorative inserts (ears, face, feet)
• Bottom plate attaches with M3 screws

🥚 Using the Egg-O-Matic

• Works great with:
  • Hard-boiled eggs
  • Plastic eggs
• For edible decorating:
  → Edible Food Coloring Markers such as these

Just spin and draw — stripes, spirals, and patterns are super easy and fun 😄

💡 Tips

• TPU tires provide grip while protecting gears
• If needed, gently adjust egg position for centering
• Spring-loaded wheels help accommodate different egg sizes
• Motor mode gives the smoothest results, crank mode adds interaction

🛠️ Assembly Instructions

Assembly is straightforward and mostly press-fit. Follow the steps below based on your chosen build (hand crank or motorized).

🔧 1. Install Bearings & Wheels

• Add TPU tires to the wheels
• As shown in the diagram, for each axle, Install wheels and spacers and bearings and egg gear
• Press the prepared axle down into the cage

• Install bearing caps if needed for a tighter hold

   

2. (Motorized version)

• Connect the motor output shaft and the motorized crank shaft with the crank gear

• Slide the TT motor's USB cable through the mount and then through the cage hole.  If you printed the Motorized Body you will have a hole for the USB wire

finally, press fit the assembly into place

2.5 Hand Crank Version

Starting with step 1 above, you should have an assembly that looks like the following:

•  Pre-assemble the knob, crank arm and crank shaft.  You can glue the arm to the shaft if you wish.  The knob screws to the arm with a M3x30mm screw.  Do not overtighten, you want it loose so the knob can freely rotate.

• Now pass the crank shaft through the hole in the body (from the hand crank profile) and finish assembling the shaft with the bearing and crank shaft collar

• Finally, gently press the shaft and bearing into the center bearing holder and line up the gear.

3. Cage and Body assembly

• Using the M3x6 screws, mount the cage to the bottom part
• Place the USB wire across the hole in the bottom 
• Place the body (motorized version) onto the bottom plate

• Using M3x6 screws attach the bottom to the body

   

4. Body decoration

• Place and glue each of the colored inserts into the ears, head, and feet
• Glue the feet, head and ears together at designated mount points

 Enjoy!