Hi everyone,As part of a research project, I am given the STL data of a hollow tube with irregular geometry. I would need to take a thin slice of this tube at one given position, and export it to STL format again (to simulate kind of a curtain inside the tube).I have been working exclusively with NX Siemens up until now, but it seems that this program is unable to create solid bodies from an STL file (only a facet body with which I cannot do anything).Does anyone have advice on which (free) program I could use to get this task done?Thanks in advance for your input.Nick

You might want to check out Fusion 360 by AutoDesk.