Prusa's design of the bicycle bottle cage is great. But unfortunately, the model file cannot easily be edited. If you have a non-standard bicycle mount or you want to transport other types of bottles, you need to make adjustments. That's where my OpenSCAD recreation of the model comes in handy. All the major parameters are fully customizable at the top of the source file.
Recreations of another 3D model are rarely pixel perfect, but I have tried to stay as close as possible to the dimensions of the Prusa design. There are a small number of notable differences though. I did not implement the sweeping curves on the bracket that attaches to the bike. I was afraid it would weaken the mount points too much. I also thickened a few other parts.
And I didn't bother implementing the logo on the side of the bottle holder. This is doable with OpenSCAD. But it is tedious to make it look pretty, and it simply wasn't a priority.
The original version of Prusa's bottle cage can be found at https://www.prusaprinters.org/prints/5003-asa-bottle-cage
Please note, that while I am the author of the OpenSCAD version of this model, the original design was not made by me and instead is copyrighted by Prusa Research, and was released into the public domain under a Creative Commons CC0 license.
You can also find this model on Prusa Printers.