{"id":456645,"date":"2026-04-18T11:43:56","date_gmt":"2026-04-18T11:43:56","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/structural-optimization-stl-smoothing-not-working\/"},"modified":"2026-04-18T11:43:56","modified_gmt":"2026-04-18T11:43:56","slug":"structural-optimization-stl-smoothing-not-working","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/structural-optimization-stl-smoothing-not-working\/","title":{"rendered":"Structural Optimization STL Smoothing not working"},"content":{"rendered":"<p>&lt;p&gt;Hello!&lt;br&gt;So I am trying to do an topology optimization for a gearbox with 2 housing parts. I have set up my static structural and structural optimization analysis and also have a result using the mixable density method.&lt;br&gt;Now I want to validate my design without having to set up the problem again from scratch.&lt;br&gt;I tried adding a STL Smoothing to my Topology Density output and ran into the following problem:&lt;br&gt;STL Smoothing works only as long as I have the &#8220;Export Model&#8221; setting set to No. As soon as I change this to &#8220;Yes&#8221; and try to evaluate the same result, I get the following error message:&lt;br&gt;&#8221;Error &#8212; The slicer was not able to produce a valid model, this is may be due to very thin part in the topology solution. Try to refine your model or to play with the density threshold if possible. Warning &#8212; STL file is corrupted, please check the file.&#8221;&lt;br&gt;&lt;br&gt;Can anyone tell me why that is the case?&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-456645","topic","type-topic","status-publish","hentry","topic-tag-design-optimization","topic-tag-smoothing","topic-tag-stl","topic-tag-structural","topic-tag-topology-optimization"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["456645"],"_bbp_subscription":["677468"],"_bbp_author_ip":["2001:67c:10ec:574f:8000::a5"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["456645"],"_bbp_last_active_time":["2026-04-18 11:43:56"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["677468"],"_btv_view_count":["14"],"_bbp_topic_status":["unanswered"]},"test":"mohoferstudent-ethz-ch"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456645","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456645\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=456645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}