Explore the challenges and solutions of developing end-user software for 3D printers using Python in this 31-minute EuroPython 2021 conference talk. Gain insights into creating OctoPrint, an open-source web interface for consumer 3D printers, and learn about maintaining software for non-tech-savvy users. Discover strategies for tackling issues such as initial installation, backwards compatibility, Python 3 migration, and performance optimization. No prior knowledge of 3D printing or specific Python tools is required. Benefit from the speaker's experiences and avoid common pitfalls in developing user-facing software.