... - where be that? I found Options> Space Units...> Metric which does the job, but it is available only after loading a file, and has to be re-set every time. TC Deluxe 20.2 -- are we talking about the same program? How can we find if the 1532 errors are caused by the STL conversion, or in the original DXF? I tried a different route to an STL -- 3D Crafter+ MeshLab. Slicer now says it auto-repaired 6351 errors! 2_051715_490000000.png Interesting -- that is an odd number, bearing in mind there are 2 identical objects in the file? cheers, Martin. posted: 5 Aug 2018 22:29 from: Martin Wynne Andrew Barrowman wrote: Import the STL then Edit, Fill Hole (You should see a list of holes) Now- Filters, Remeshing etc, Close Holes- and apply the fixes. Now back to Edit, Fill Hole- and it will tell you there are no holes now. Hi Andy, Thanks, but bad ...