In formicarium setups most new queens are kept in 16mm x 150mm or 20mm x 150mm test tubes until the fledgling colony is large enough to move to a larger formicarium setup. This design includes both 16mm and 20mm tube diameter files and keeps test tubes from rolling around in containers. It has applications other than Myrmecology but it's listed primarily as such.
| 16mm_test_tube_holder.ipt | 217.0KB | |
| 16mm_test_tube_holder.stl | 136.6KB | |
| 20mm_test_tube_holder.ipt | 197.5KB | |
| 20mm_test_tube_holder.stl | 125.4KB |
