This thing is great. I printed a couple for my mother who enjoys the feeling of it massaging her hand. One gotcha is that if you print with 2-sided filament, since it prints both halves at once, the top and bottom will have opposite colors. I'm not sure if there's any way around that. Maybe changing the threading so it goes another 180 degrees. But whatever, not even a huge deal, just something I noticed.

So cool! I printed on for my son and my daughter got jealous so I printed one for her too. Then my dad came to visit and I had to print one for him too! Besides looking cool and feeling cool, it also sounds really cool. It engages three different senses making it one of the best toys I've printed. Printed in rainbow PLA three times and it came out in three different great combinations.

This size is really nice for one-handed fidgeting. Printed in PCTG which worked far better than my first try in PLA. My elderly mother used it to fidget while she was getting an MRI and said it was a massive help. Thanks!

Way too small for me. Also I printed in PLA and realized PLA just kind of sucks for these print-in-place mechanical things.

Didn't work very well in PLA. Worked fantastically well in PCTG. This has been a game changer for my bedside cable management and I will be looking for opportunities to use it other places as well. This is easily one of my favorite "functional prints" I've made since I got the printer.

Not much to say... it works. I definitely does the thing. Keep up the good work!

So it prints well, fits my hand well, but doesn't quite work as well as I'd like. The main issue seems to be my case. The pictured case has one of those soft/high-friction cases that likely keep it from sliding around. My case is smooth and not slippery per se but not particularly high friction either. The upshot is that it just has too much movement on the bottom of the phone to be particularly useful. It's a shame, I definitely get the sore pinky from time to time. But I can't blame the design. I'd just suggest to put something in the description noting that a slippery case or phone will not work well with this. Maybe I'll see if I can design a TPU sock to go over the end and see if that helps...

I have printed a ton of these so far and they work great. I prefer the non-locking ones but the locking ones do probably work better.

Does what it says. Nests perfectly in the larger ones.

Does what it says and does it well. Printed some smaller ones to nest and they fit perfectly.

I really love the design and the idea behind it. Unfortunately, I've just been unable to get it working. I've printed it in 4 different filaments, I bought some oil to try and I watched the debugging video and even when everything seems like it should work and the pieces all work fine in isolation, I can't get it to work right all together. I am fairly sure the problem is mostly a me thing, but clearly the design is also a little finnicky. Hopefully the designer does end up making an new and improved version as I'm obsessed with mechanical clocks and watches and would love to try more at this high level of attention to detail.