This pitter prints clean without any supports. The pitting is reliable and as you can tell from the photos, pretty clean.
If you have a spring 3*1.8cm lying around you can put it in there like I did but it is definitely not needed.
As in the original file, the CP1 and CP3 parts should be glued together.
Update 1: Now should splice correctly with all programs.
Update 2: I didn't think, this would get more than a few likes so I didn't bother improving the original design further. Now that people actually print this, I will consider suggestions and improve it further when I find time and motivation. For now I removed the sharp edges at the finger holes.
3 outer layers make it durable