This release contains our repository consisiting of Jupyter notebooks with the code that was used to segment the data in our paper "A massively multi-scale approach to characterising tissue architecture by synchrotron micro-CT applied to the human placenta". Notebooks can be run on Google Colab if needed, which is useful for those who do not have access to a GPU or a working Python environment with the correct libraries installed. In addition, the volumes of the data that were used to train the models described in the paper are contained within this repository.