I often have the problem, that imported CAD-models have fillets and chamfers all over the place.
_This here is a Duplo Track from here: https://www.thingiverse.com/thing:2758783_
Then I found an easy solution!
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Change pivot point to 3D Cursor
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Go to Edit mode [TAB]
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Select the vertex at the end of the radius (fillet)
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Press [SHIFT]+[S] then “Cursor to Selected”
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Select all the vertices from this fillet
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Press [S], [SHIFT]+[Z], [0]. In my case, that is! What it does: It scales all the vertices in XY to 0. All the vertices are now on the Z-axis. If your fillet is on an other axis, just scale to that.
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Let’s repeat that an another fillet (and for each you want to remove):
a)
b)
c)
d) -
(Optional) leave edit mode and apply a “Decimate” modifier to reduce the unneeded faces, edges and vertices (in my case I used the “Planar” option).
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Use the “3D-Printing” add-on to make sure it’s all tight and clean to print.