CAD Model for Silicone Mould

I have a small prototype part sketched out—just simple outlines on paper—but I need it turned into a clean 3D CAD file that I can send straight to a resin printer. The printed master will be used to make a two-part mould so I can cast the piece repeatedly in food-grade flexible silicone.

Here’s what I already have:
• Hand sketches showing the basic geometry and overall size.
• A clear idea of the part’s function and how it must flex once it’s cast.

What I need from you:
• A watertight 3D model (.STL and .STEP) accurate to my dimensions, ready for high-resolution printing.
• Thoughtful draft angles and venting points so the printed master releases cleanly from the mould.
• Wall thickness and fillet choices that suit food-safe silicone (Shore A 20-30) and hold detail without tearing.

Acceptance criteria:
1. The file loads in PrusaSlicer and Fusion 360 with zero repair flags.
2. No undercuts that would lock the part into a simple two-part mould.
3. All critical dimensions match my reference sketches within ±0.2 mm.

Once I approve the CAD, the job is done; I’ll handle the actual printing and casting. If you prefer SolidWorks, Fusion 360, or similar, that’s fine—just export the final STEP and high-resolution STL.

I’m ready to share the sketches and answer any follow-up questions as soon as we start.