Finger Massager V4

EDIT::
I have changed the rollers from the first model to better fit and feel more comfortable. Version 3 wasn't as good as I had hoped. I thank you for the input in helping me make this better. 

This is my first model. I had a finger massager given to me as a gift, they are $6 on Amazon. Within a day I lost one of the rollers as it popped out. So I decided to try my hand at redesigning it. I downloaded and learned Shapr3D to come up with this. I'm still learning my printer settings and hope that at least if you try it, you can comment on what I can make better. I have included my Shapr3D file as well if you want to play with it. I'm fully open to suggestions and hope you enjoy this. 

I forgot to mention that this helps my joint and finger pain from Carpal Tunnel syndrome and Arthritis. I'll be playing with the roller design next in hopes to find something comfortable for everyone.