Welcome and Congratulations!
As far as I know, no one has posted Arch Reactor .stls to Thingiverse yet. I am going to attach the .stl I have been using to print Arch Reactor logos for demonstrations events. You will want to print with a raft, otherwise you will just end up with loose letters. There is also our Fleur-de-lis that prints separately with it.
Let me know if you have any questions. Good luck!