Massage rollers kit

There are number of massage tools here already but I am not enthusiastic to print something long but thin and I am not enthusiastic to print something that is easier to buy. So I used regular Ø25mm plastic tube as a basis and printed notched sections only.
Number of sections can be chosen for proper massage tool length (the thing on the photo is 25cm working length and 50cm in total) and single section size could be varied as well.
Make a note that the inner radius (Rth) has small addition to