Shenzhen Alu Rapid Prototype Precision Co., Ltd.

Creating a plastic mold for injection molding allows you to produce custom plastic parts by injecting molten plastic into a mold cavity, where it cools and solidifies. This process is commonly used for prototyping or small-scale production. For beginners or DIY enthusiasts, the most accessible method involves 3D printing the mold using CAD design software and a resin printer. This creates a durable, heat-resistant mold suitable for low-volume runs (e.g., 50-100 parts). For higher volumes, professional machining from metal (like aluminum or steel) is recommended, but that's more complex and costly.Below is a step-by-step guide based on proven DIY techniques. This focuses on a two-part mold (core and cavity halves) for simple geometries. Always prioritize safety: wear protective gear (gloves, goggles, respirator) when handling resins, heat, or chemicals.

Materials Needed

Resin for 3D printing: High-temperature or rigid resin (e.g., Formlabs High Temp Resin or Rigid 10K Resin) for heat resistance up to 200-300°C.

Plastic pellets: For testing (e.g., ABS, PLA, or HDPE; start with low-melt options like hot glue for proof-of-concept).

Mold release agent: Silicone-based spray to prevent sticking.

Optional: Beeswax or polyurethane resin for casting durable inserts; aluminum ingots for metal molds (advanced).

Tools Needed

CAD software: Free options like Blender, Fusion 360, or Tinkercad for design.

3D printer: SLA/resin printer (e.g., Formlabs Form 3+) with print prep software (e.g., PreForm).

Post-processing tools: UV curing station, fine-grit sandpaper (400-800 grit), isopropyl alcohol or acetone for cleaning.

Injection setup: Benchtop injection molder (e.g., Galomb B-100) or DIY hot glue gun for initial tests; oven or heat gun for preheating.

Step-by-Step Guide

1.Design the Mold in CAD Software

2.Prepare and 3D Print the Mold Halves  

3.Assemble and Reinforce the Mold (Optional for Durability)

4.Test and Refine the Mold