A roll to loosen sticked fascia in your foot, simply place it on the floor and roll your foot over it with some pressure.
for better grip on smooth surface I added two O-Rings (38x1,5mm).
The inside is hollow to save time and filament but also to improve stability.
print with standard settings
0,4mm nozzle, 0,2mm Layer
The author hasn't provided the model origin yet.