This is very helpful. Problem resolved, thanks again fc_tofu. Thank you fc_tofu. You didnot give a sample file. So I use PartWB cylinder primitive as test example. The topology of exported mesh is basically same as Rendering mode >Hiden line (Tesselation). fsc_2020-05-12_125912.jpg The setup of tess...

Thank you fc_tofu. FreeCAD Ver. 0.18 This is the screenshot of .stl exported from the solid part. You can see the arrowed part which is supposed to be a smooth circle, but the resolution was lowered once I did export file to .stl format that is not fit for 3D printing. 屏幕快照 2020-05-12 上午10.57.48.png...

准备3D打印，可是发现输出*.stl文件后，分辨率降低，请教如何解决？