I am looking for a quick and easy way to view .stl files on ubuntu.

I have download various CAD programs but the only one I can get to work is FreeCAD which takes ages to load.

I stumbled upon fstl which is a fast loading .stl viewer which fits the bill. The only problem is that I can only open this program from the terminal.

My ultimate aim is to set ubuntu to open .stl files with fstl by default when I click on them. Right clicking on a .stl file and clicking "open with another application" gives me a list of applications which does not include fstl or even FreeCAD.

How do I add fstl to this menu? Did I not install it properly? I had to use synaptic package manager since it wasn't on the software store.

I'm running Ubuntu 19.10

Thank you


1 Answer 1


Solved - I entered the following commands in the terminal:

"mimeopen -d examplefile.stl" (where examplefile is a .stl file on my desktop)

"4" (for "Other...")


This is the terminal output:

user@yourcomputer:~$ mimeopen -d examplefile.stl Please choose a default application for files of type model/stl

1) Blender  (blender)
2) Cura (4.4.1)  (appimagekit_6ac323bcce2d099d10c57f4ce4a308a0-Cura)
3) Darktable  (darktable)
4) Other...

use application #4 use command: fstl

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