software version Zbursh2021.1.5, retain multiple subtools, most of which retain the 6~7 subdivision level, some of the poly amount are too high and have been optimized to reduce, see the screenshot for details. In addition, the obj general format file version is packaged separately for download. The obj version has all been optimized and reduced, contains two optimized versions with different poly amount levels，and the output size 10.2*214.4*4.8mmSome subtools in the ztl source file left holes in the production process, which were closed when optimizing the output of obj and stl. You can get more information from the preview pic.If any question please write to me.