Customizable Protective Octagonal Bellows

Quick and dirty code with few protections.
Print in vase mode with some not to brittle plastic
Don't go crazy with radius .

As usually i appreciate reports of successful prints especially in flex type materials .

x = 25; // bellows inner measurement
y = 50; // bellows inner measurement
approx_z = 100; // bellows relaxed height without sleeves
steps = 10; // number of folds
step = round(aprox_z / steps);
z=step*steps; // exact height

ext = 1.5; // fold horizontal extension multipl