If you have a computer model it should already be in a file like stp or iges etc.
You can open that in a CAD type program then export it as an STL, OBJ ,AMF etc. and these should be importable to almost any slicer program.
If you want to know about CAD software you certainly could bring up a specific question.
I also have another printer coming, the Prusa Mini. I have the MK3 already and it is great, the Mini is supposed to be as good if not better, now that they have the production problems straightened out, we will see it about the middle of January.