Battery-less variants available for purchase at my shop if you're interested: https://bonzosretro.shop/products/3d-print-sanni-open-source-cart-reader?variant=45933636976918
The author remixed this model.
I removed the battery opening on the bottom. Replaces base file from Kytor's repo. All other parts are still needed.
https://www.printables.com/model/409926-kytor-industries-fully-enclosed-open-source-cartri