A4tech G9-500 mouse battery cover
thingiverse
Battery cover for A4tech G9-500 optical mouse. I believe it may also fit the G9-500F model, but I haven't tested it myself. The model is optimized for printing without supports, using a 0.4 mm nozzle (0.4 mm line width), 0.2 mm layer height, and 100% infill. Therefore, I recommend using these parameters. I printed one with PETG material at 25/20 mm/sec with minimal cooling. It fits perfectly in my old mouse. I haven't tested the model with other materials. If you try it, please leave a comment about how it fits your mouse.
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