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Rat cap system

Rat cap design for silicon probe implantation. The fully assembled cap weighs 9.39g.

Rat cap

Table of contents

  1. Printing and assembly instructions
  2. Materials
  3. Stl files
    1. Rat cap base
    2. Left wall
    3. Right wall
    4. Lid
  4. Citations

Printing and assembly instructions

Download stl files from our GitHub repository. The .stl files are optimized for Formlabs Form2 printer and Grey-v4/Clear-v4 Resin. For other printers and/or resins, some modifications may be necessary.

See video below. Detailed assembly instructions are available for the cap system.

The assembly video is also available on youtube.


Rat cap v08

QtyNameVendorItem number/Link
100-80 screw 1”McMaster92196A060
100-80 brass insertMcMaster92395A109
200-80 screw 5/32”McMaster92196A053
1male header pinDigiKeySAM1067-40-ND
1copper tapeMcMaster76555A724

Optional lid (to close cap for extended period of time)

QtyNameVendorItem number/Link
1M2x0.4 Thumb screwMcMaster99607A256
1M2x0.4 THIN nutMcMaster93935A305

Additional tools

QtyNameVendorItem number/Link
100-80 tapMcMaster2523A461
10.05” hex key  

Stl files

All stl files are available for download from our GitHub repository.

Rat cap base

Left wall

Right wall



If you use our designs, please cite our paper: Metal microdrive and head cap system for silicon probe recovery in freely moving rodent Mihály Vöröslakos, Peter C. Petersen, Balázs Vöröslakos, György Buzsáki doi:

The designs are distributed under GNU GPLv3 license.