An inline cage swimfeeder. Cage size is 41mm x 32mm diameter. Printed in PETG, 4 outer shells, 3 bottom/top layers, no supports, 100% infill. Print time is around 1.5 hours at 0.2mm layer height. A 4x18x35mm cavity is included for adding a weight if desired (glued with epoxy in the above image). Tried and tested, best used in still or slow moving water.
The author hasn't provided the model origin yet.