This model is a simple, field-tested trap designed for collecting subterranean amphipods, especially Niphargus species, in caves, springs, and flooded mine systems.
The design is based on practical field use — minimal parts, easy handling underground, and reliable performance even in low-access environments.

Printing notes:
Supports required (tree supports recommended)
Recommended material: PETG
Layer height: 0.2 mm
Nozzle: 0.4 mm

Important:
Cover 1 ×2 (print twice)
Cover 2 ×2 (print twice)
These parts are used for both sides of the trap.