u/IgnoranceIsAVirus

Trying to get my 3dprint cnc milled in aluminum but when I send it through an online stl -> step the manufacturer says they cannot make it due to broken surfaces. they can't "print " aluminum but can print in stainless 319.

it Prints perfectly on my adventure pro 5m, slices fine, tried in freecad to export it to step but they don't accept it. I literally don't see what they're complaining about.

I have files and photos upon request and really want this in aluminum - anyone know a cheap / decent aluminum 3d printing service or can tell me what's broken on my files would be greatly appreciated.