Minor Modification to 3D STL Model

I need a skilled 3D modeler to make a minor modification to a mechanical part in STL format. The task involves closing two small gaps, each between 1mm to 5mm, to ensure the part prints cleanly without requiring supports. These gaps are due to a design change I intend to implement myself, but they currently affect the print quality.

Key Requirements:
- Close two gaps (1mm to 5mm) in the STL model
- Ensure the model is optimized for clean 3D printing
- Maintain the integrity and functionality of the mechanical part

Ideal Skills and Experience:
- Proficiency in 3D modeling and editing, specifically with STL files
- Experience with mechanical parts and understanding of 3D printing requirements
- Attention to detail to ensure precise modifications

Please ensure you understand the task before bidding. Generic bids or attempts to persuade without addressing the issue will result in being blocked and reported.