I uploaded you skp file an open it Took line tool closed the 4 areas check dimension [image: njNU_pic_0026.jpg] resized top 3 areas pushpulled the botttom one Context Intersect with selection [image: tbkM_pic_0027.jpg] Trim and remeasured Tested the volume and smoothed the edges Tranpanency mode [image: 2Sze_pic_0028.jpg] My error was inside material need deleted before runing the test If makring a ring skin then 10) After push-pull smooth the pull volume 11) Context Intersect with selection 12) Make group then explode, use the erase on back edges [image: YVYQ_pic_0035.jpg] 13) Done [image: zdBk_pic_0036.jpg] I hope this may help?