In 2021 TMS research groups in the United States and Canada reviewed the approach. Their feedback was consistent: the idea is sound, and a positioning device stands or falls on validation data. That set the agenda for the next years: make the guide stable, then measure how well it reproduces the coil position.
In 2022 the project moved from Ukraine to Austria, and development continued in Linz. In March 2023 a TMS planning module was built on the open-source 3D Slicer platform. It places a 3D model of the coil on the MRI-based head model, accepts targets as MNI coordinates and has been tested on adult and paediatric MRI data. The planned coil pose becomes the shape of the printed guide.
In May 2023 the service went online under the name Multistim, and in September 2023 the Austrian patent application A50952/2023, "Helmet for non-invasive brain stimulation", was filed.
In December 2023 a German research institute received the first research helmets, ordered through its official procurement and made on an industrial 3D printer in Linz. The lab supplied an MRI-based head model with the coil already in the planned position, and the helmet was built from it.