Optimize STEP Files for Creality

I already have the enclosure and matching lid modeled as two STEP files; no geometry changes are needed. What I do need is a complete, ready-to-print Creality K2 project (slicer profile and/or G-code) that delivers reliable results on the first run... (Budget: $30 - $250 USD, Jobs: 3D CAD, 3D File Scaling, Slicing & Print Preparation, 3D Print Design, 3D Printing, Arduino, Electrical Engineering, Electronics, Microcontroller)