Removing from the print plate
Slow and steady wins the race
You could go ahead and give a little trip to the gears where they were connected to the Edge for a finer result.
Putting it together
I used a vice and it basically solved all of my problems here,
Although I am sure a hammer or a strong friend would do just fine.
Violence is permitted.
Inventor by Autodesk
2016 Student edition, highly recommended. I have included the Inventor file if you want to change or check anything, a good opportunity to learn as any!
Adding your own text
I have included 2 ZIP files, one with a name, extract the contents to a normal folder.
If you have Inventor 2016 or newer on your computer just open the Assembly file, where is says "Text" you double click a few times until you go into edit mode, Change what you like.
Use the arrow on the top right to go back to the part and click extrude, you go extrude the text outward or inward (removing matter).
Use the arrow again to go to the assembly and click on the little "I" on the top left, go to "Export" and "CAD FORMAT". Change file type to "STL" if it isn't already set to it and enjoy you personal fidget card!
(Spur Gears are found under the "Card" folder)