Took me a few tweaks but here is my pretty easy and simple design for a 3 finger claw... Oops I meant Revolution not Evolution....
Printed in ABS @200micron resolution
Printed on an enclosed Up! Plus 2 printer...
Print time for both was just over 2 hours hour
Print orientation on their side (vertical). Although it produces way more support material they just didn't print as well on their back... Your results may differ, however.
You may also need to do a little sanding