Sketchup STL Model Export question

[Kentamanos]

Another thread about the overloaded file extension:

Thingiverse "Certificate Trust List"

Ok, this is probably a PEBKAC error, so please bear with me. I went to the 3D printer class last night and got all excited and came home and got on Thingiverse to find something to print. Found a little keyfob thing, customized it with my name and downloaded it. When I go to my downloads to move it to my flash drive, I get an error that reads, “Invalid Public Key Security Object File This file is invalid for use as the following: Certificate Trust List.” I don’t use any shareware and I’m …