Automatic Feeder optimized for grain
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This Automatic feeder is optimized to feed grain-like food to rodents / chickens / rabbits.
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Model information
- Source
- Printables
- Category
- Pets
- License
- Creative Commons — Attribution
DIY Automatic Rodent Feeder
An automatic feeder designed to dispense grain, seeds, and pellet-style food for small rodents.
While I designed this to specifically fit my need I thought you might get some value from this model. It reliably keeps our six mice well-fed!
Bill of Materials (BOM)
Item | Details / Specifications |
DC Gear Motor | 5V Micro metal gear motor. I used this one. But I bought it ages ago.  |
Motor Driver / Controller | Any method to drive/time a 5V DC motor (e.g., ESP32, Arduino, timer relay, or smart plug) |
Bottle | ~60 mm body diameter with a 40 mm cap |
Bearing | 683ZZ or similar: 8 mm OD × 3 mm ID (Optional: the model can be modified to run without it) |
Fasteners | • Assorted M3 screws • M3 heat-set threaded inserts • 2× M3 set screws (grub screws) |
Assembly Steps
Prepare the Hopper: Cut a hole through the center of the bottle cap to allow food to flow into the housing.
Install Threaded Inserts: Heat-set the M3 threaded inserts into the designated body mounting points.
Mount the Motor & Auger:
Insert an M3 heat-set insert into the shaft coupling of the auger.
Key the motor shaft into the auger and secure it with an M3 set screw (Note: You may need to lightly drill/clean out the shaft hole for a smooth fit).
Front Auger Securing: Insert the second M3 heat-set insert and set screw into the front end of the auger.
Install Bearing & End Cap: Press-fit the 8 mm bearing into the end cap, slide the auger assembly into the main housing, and fasten the end cap.
Attach Bottle: Thread or press the modified bottle assembly into the feed inlet.
Tip for Custom Bottles: If your bottle has different dimensions, you can easily adapt the model in your slicer using standard cylinder boolean cuts/joins or simply edit the raw CAD file.
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To fill the bottle