3D printed test strip maker

[Xylo]

Every time I've tried it, it imports as an uneditable object

There's a trick to it. Check out this video where they explain it

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Essentially, you import the STL and select it, go to the Part Workbench, Part/Create shape from mesh, then Part/Create a copy/Refine shape, then Part/Convert to solid. Once this is done, you can delete all the mods you have done before the convert to solid step and you're ready to work with it. You can add, subtract and do plane slices to it without any problem. I now use the beta of version 0.21 and it just works flawless.

 

[MattKing]

Formatting tweaked in Xylo's post above.
Usability hint:
If you wish to embed a Youtube or similar link in a post here on Photrio, the formatting works far better if the link is both preceded and followed by a blank line.

 

[Donald Qualls]

import the STL and select it, go to the Part Workbench, Part/Create shape from mesh, then Part/Create a copy/Refine shape, then Part/Convert to solid.

Wow, I'd have never come up with that on my own, but I'll have to try it; I've got a couple .stl files I need to partially reverse.

 

[Xylo]

You can do pretty much anything with them after that.
But I'll admit that if I hadn't seen the video, I wouldn't have figured it out.
Before I used to edit the STL's in Microsoft 3D, but that was just a pain.