# Problem with Surface refinement with Cell Zone **URL:** \ **Category:** Project Support\ **Created:** [October 21, 2019, 10:56am UTC](https://www.simscale.com/forum/t/problem-with-surface-refinement-with-cell-zone/86627 "2019-10-21T10:56:21Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![leon\_schmidtke](https://www.simscale.com/forum/user_avatar/www.simscale.com/leon_schmidtke/32/26977_2.png) [@leon\_schmidtke](https://www.simscale.com/forum/u/leon_schmidtke)\ **Post date:** [October 30, 2019, 9:04am UTC](https://www.simscale.com/forum/t/problem-with-surface-refinement-with-cell-zone/86627/7 "2019-10-30T09:04:40Z")
Hi @jousefm @Retsam I tried merging the STL Files both manually and with the scripts that are here: [Merging STL files - #2 by jousefm](https://www.simscale.com/forum/t/merging-stl-files/83729/2) ; and I still get an assembly of faces instead of an assembly of solids as result. I even checked the code of the files after both scripts ran and everything looks fine. ![SharedScreenshot3](https://www.simscale.com/forum/uploads/default/original/3X/f/5/f595ef8466d875b020b2a9577ee87edefc4c7411.jpeg) All solids are listed on the file, and they all start and end as I think they should… In one of my uploads ( [https://www.simscale.com/workbench/?pid=2840410787042819858&mi=geometry%3A175&mt=GEOMETRY](https://www.simscale.com/workbench/?pid=2840410787042819858&mi=geometry%3A175&mt=GEOMETRY)) I somehow managed to upload two separate solids, but when I repeat the process using the full car geometry the same assembly of surfaces appears. Do you guys have any other suggestions? Thank you in advance, Antonio Targat --- _[View the full topic](https://www.simscale.com/forum/t/problem-with-surface-refinement-with-cell-zone/86627)._