I need my obj / stl files edited for 3D product printing

I'm looking to work with someone reliable long term who can help me edit 4 files so I can start 3D printing the products.

The product is 4 Call of Duty gun keyrings (AK 47, CR AMAX, MP5 & KAR 98K).

The files are made but I require further edits to make the smaller parts of the design 3D print-friendly.
I don't want to wait weeks for edits.

I want someone reliable who I can work with to create further Call of Duty gun keyrings in the future and someone who I can go back to if I need further edits on the files.

Budget is flexible

I've attached a pdf brief of the changes I need.
Please look