Just a reminder, it is hollow.

Already installed. it fits and have a good grip

Amazing design

It is practical, but it bends a little with a backpack and a a few notebooks. It would be better to add more walls to the default models. it prints fast

I must say, my favorite feature is the stacked circles, it works so well. I think one day the flange for the button will fail, but I've using for 2 weeks without problem.