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The uterus is the organ for embryo implantation and fetal development. Most current models of the uterus are centred around capturing its function during later stages of pregnancy to increase the survival in pre-term births. However, in vitro models focusing on the uterine tissue itself would allow modelling of pathologies including endometriosis and uterine cancers, and open new avenues to investigate embryo implantation and human development. Motivated by these key questions, we discuss how stem cell-based uteri may be engineered from constituent cell parts, either as advanced self-organising cultures, or by controlled assembly through microfluidic and print-based technologies., Bergmann et al. discuss the construction of synthetic uteri to model the earliest stages of human embryogenesis and associated pathologies. They highlight the constituent components from which a synthetic uterus may be engineered, propose a modular approach to assembling synthetic uteri and discuss how these technologies can shed light on implantation failure and uterine pathologies.