Hi, Susan, As we've just passed the 30,000 face shield mark, there are a few key points we've learned. (1) Production is different than academic or for-fun making. It's required tracking of finished products in case of contamination, and we still have work to do to make supplies tracking manageable for the staff. (2) It's about supply chain. We had some concerns along the way about availability, but thanks to some established relationships and a persistent project manager, we have had few delays. (3) Design and selection of tools is IMPORTANT. We designed alongside our healthcare professionals but applied key "maker" knowledge and ingenuity. The simple design was best - 3 components and cutting of parts only - no 3D printer used. This gave us speed in production as well as some flexibility in materials (see point 1 on supply chain).