This small fish feeder can be easily printed without supports in PLA with a nozzle diameter of 0.4 mm. A brim might be helpful for printing the screw, but I printed it without (base down see images). The feeder can be controlled with a cheap 5 or 12 V stepper motor, ULN Driver Board and Arduino Uno/Nano. The setup is running now more than a year without any failures.
The author marked this model as their own original creation.