Silicone Wound Packing Trainer Mold - Bullet

DIY silicone wound packing trainer mold designed for Stop the Bleed, EMS, and trauma simulation training. This model creates a durable, reusable trainer with realistic depth and resistance for practicing proper hemorrhage control and wound packing techniques.

This is a 3D-printed mold for silicone casting, not a finished trainer.

🔥 Why This Trainer Works

• Deep wound cavity for realistic packing resistance
• Durable silicone allows repeated use
• Low-cost alternative to commercial trainers
• Scalable for group training (make multiple units easily)

🎯 Ideal For

• Stop the Bleed courses
• EMS / paramedic training
• Nursing & medical education
• Simulation labs and skills training

🩸 Optional Enhancement (Highly Recommended)

This model can be modified to simulate active bleeding:

• Add tubing to the base
• Connect to a syringe or IV bag
• Create realistic bleeding during training

👉 This significantly improves realism and learner engagement

🧰 Materials Needed

• Ecoflex 00-20 or 00-30 silicone
• Silicone pigments (flesh + red tones)
• Mold release (Ease Release 200 or similar)
• Flocking (optional, for added realism)

A 2 lb kit will produce multiple trainers

🖨️ Printing Notes

• PLA or PETG
• 0.2 mm layer height
• 2–3 walls
• ~15–25% infill

Ensure smooth print surfaces for easier demolding.

⏱️ Difficulty & Time

• Difficulty: Intermediate
• Active build time: ~1 hour
• Cure time: ~4–6 hours

✅ Expected Result

The finished trainer provides realistic tactile feedback and resistance for repeated wound packing practice, making it ideal for both individual and group training environments.

🔗 Related Models

Check out the Large Laceration version for additional training scenarios.

🧪 Casting Instructions (Simplified for MakerWorld)

1. Prep the Mold

• Clean and dry mold
• Apply light, even coat of mold release
• Let sit ~5 minutes

2. Plan Your Batch

• ~300 mL total silicone per trainer
• Split evenly:
  • Part A: 150 mL
  • Part B: 150 mL

3. Mix & Color

• Add pigment to Part A and Part B separately
• Match color before combining
• Add flocking for realism (optional but recommended)

4. Combine & Mix

• Mix 1:1 (A + B) thoroughly
• Scrape sides and bottom
• Mix for 60–90 seconds until uniform

5. Pour

• Pour in a thin stream to reduce bubbles
• Tap mold lightly to release trapped air
• Slight overfill is OK

6. Cure

• ~4 hours at ~73°F
• Longer if cooler
• Do not disturb during cure

7. Demold & Trim

• Gently flex mold to release
• Trim excess silicone (flash)
• Keep outer lip for fluid containment

🩸 Optional: Add “Blood Layer” 

• Mix SIL-Poxy + NOVOCS to thin
• Add small amount of red pigment
• Paint inside wound cavity
• Let cure ~1 hour before handling
• Full cure ~24 hours before use

🩸 Optional: Add “Active Bleeding” 

• Insert 1/8" silicone tubing through side of trainer and into cavity.
• Use metal rod or awl to create tract and introduce tubing
• Attach syringe, accessory IV bag, or ketchup bottle as blood source

💡 Pro Tips 

• Tint A & B separately → prevents color streaking
• Avoid latex gloves → can inhibit silicone cure
• Pour slowly → reduces bubbles
• Add slight color variation → improves realism

⚠️ Common Issues

Sticky or uncured silicone

• Likely contamination (latex, sulfur, etc.)

Color streaking

• Not mixing pigments evenly

Air bubbles

• Pour too fast or too thick

🧼 Cleanup & Reuse

• Wash finished trainer with mild soap + water
• Reapply mold release before each use
• Store molds clean and dry

License CC BY-SA

Wound packing - molds for silicone casting
by decentsimulators is licensed under the Creative Commons - Attribution - Share Alike license.