Issue:
Import Mesh block displays the message “Stream error” when trying to open an STL file.Applies to:
- ASCII STL
Cause:
This error occurs if an STL was created using an ASCII representation, and the Header exceeds 100 characters.Solution:
- Make a copy of the STL as a backup.
- Right-click the STL file and select Open with > Notepad
- On the first line, after the word “solid,” eliminate some text until the Header contains fewer than 100 characters.
- Click File > Save
- How to export an STL
- nTop Platform Troubleshooting Guide
- What file types can nTop import and export?

