I thought the Thinker Bookend by bhty looked great, but was a bit small.

You can of course just upscale the original model in your slicer software, but I made some customizations to fit on my Ender 3 S1. Nothing special, but I thought someone out there might want a bigger model as well and I could save you some time.

1. Doubled the size of the sculpture. From a model height of ~11 to ~22 cm (~8.7").

2. Adjusted the flat part, on which the books stand on. I made sure it kept the same thickness as the original model (not 2x from scaling it up). I shortened it to a reasonable length, and to fit it on a Ender 3 build plate.