meshmixer VS Slic3r

To add a bit to what others are saying. Mesh mixer is sometimes a great tool for some of this. Source: 8 months ago

Ah right. If you can't get the source file, you could try smoothing them out in meshmixer. Source: 10 months ago

The quickest fix I know is to use the free meshmixer. Source: about 1 year ago

There are programs such as Meshmixer specifically intended to do that, others such as Blender which can do a good job (but beware of missing surfaces or inside-out triangles) and some CAD programs such as Fusion 360 which have the ability to convert meshes. Even Tinkercad can make some changes. It's always better to get a CAD file in a common interchange format such as a STP (STEP) file if you can, though. Source: about 1 year ago

Meshmixer seems to be no longer in developement, with their integration of similar features with fusion360 according to their site https://meshmixer.com/. Source: about 1 year ago

I split my Boba Fett helmet STL in Slic3r. It was incredibly easy to split the file into 8 parts. The top and bottom halves split at the visor line, then split those pieces into halves and then halves again so they will fit on the bed. Source: almost 2 years ago

Try using a diffent slicer. Either cura or slic3r. Source: over 2 years ago

I use Slic3r where the preview is quite easy to get, but the configuration might be a bit scary to get done (although the defaults are reasonable) as you want to try with adding or removing support material. Source: almost 3 years ago