You can buy many different types of fascia rollers to treat sore muscles after injury or sports. Most of them are good to treat a select few types of muscles due to their design.
My modular fascia roller can be customized to be your perfect tool.

I used a 25mm outer diameter electrical PVC pipe for the axle. If your country uses different PVC pipes, just scale the pieces accordingly (x,y).
The end caps (2x) should have a very snug fit. Make a few test prints and scale (x,y) them if they don't fit. If you are only a bit off you can use a hair dryer to heat them a bit and put them on the pipe.
The roller parts have an inner diameter of 26mm, so they are meant to move freely. Choose and try the different designs. My personal favourite is the flat_3elements roller with the smooth_large wheel on the side. This lets you roll your calfs and the wheel can be used to apply pressure to sore spots that are a bit deeper in the tissue. If your legs are a bit wider, use several of the flat_small elements or scale the flat_3elements in the z direction.

You get a fascia tool that is modular, very light and small enough to pack into your luggage or gym bag. And all this for very little money.

You can find a detailed description on:
https://www.instructables.com/id/Modular-Fascia-Roller/