Hello! If you're using a Sketch printer with cloud print and seeking to mirror an STL file, it might be challenging directly through cloud print.😊 However, given the restrictions on installing additional programs, you could explore online tools that offer mirroring functionality for STL files without requiring installation.😊 Simply search for "online STL mirroring tool"🕢 and upload your file to mirror it before using cloud print. This way, you can achieve the desired result without the need for additional software installations on your school computer.😇