The No-Dig Pitfall Trap:

I designed the No-Dig Pitfall Trap to allow pitfall trapping in areas where digging a hole is not allowed or impossible due to rocky substrates.
The design allows for leaving the trap in the field for several days without worry about killing fluid evaporation in hot and windy environments. The rain lid/hat is designed to restrict the size of animals entering the trap to insect size.
The trap was designed for ants but should work fine with any crawling insect. I have found covering the base with nearby material increases trap catch.
Killing fluid (ethanol works well) may be placed in a small 2 ounce portion cup which will fit snuggly into the bottom of the base. These cups worked particularly well because they come with a handy little lid you can use to safe guard the trap catch on the way out of the field.

These are the stl files necessary to print this pitfall trap on your own 3d printer. The lid and base are separate pieces that can be attached after printing.

Base:

Regular base: good for areas like stone and sand without grass or leaves

Legged base: good for most areas that have sand, grass, leaves, or soft duff/dirt layers.

Lid:

Roof/Hat/Lid: Short legs and buttresses to ensure larger animals do not crawl into the trap.

I developed these models using FreeCAD and they may be printed on any consumer or commercial grade printer. These stl files are provided for non-profit personal, academic, and research applications. Non-profit use is encouraged. If you would like to sell these plans, printed models, or derivatives of either, please contact me and we can discuss it (scholarship fund?).