This article explores Vacuum Casting versus Resin Casting, two essential methods in rapid prototyping and small-batch manufacturing. Vacuum Casting uses a vacuum chamber to remove air bubbles, producing detailed, bubble-free parts closely resembling injection molding quality. Traditional resin casting, while more accessible and lower cost, can suffer from air bubbles and surface defects. The guide covers process details, material choices, benefits, and applications, helping manufacturers select the optimal approach for quality, budget, and volume needs.