We present Twister3, a microwire twisting machine. This device greatly increases the speed and repeatability of constructing twisted microwire neural probes (e.g. stereotrodes and tetrodes) compared to existing options. It is cheap, well documented, and all associated designs and source code are open-source. Twister3 is of interest to any lab performing twisted microwire neural recordings, for example, using tetrode drives.

10We present Twister3, a microwire twisting machine. This device greatly increases the speed and 11 repeatability of constructing twisted microwire neural probes (e.g. stereotrodes and tetrodes) com-12 pared to existing options. It is cheap, well documented, and all associated designs and source code 13 are open-source. Twister3 is of interest to any lab performing twisted microwire neural recordings, 14 for example, using tetrode drives.15