Hybrid Kit for tube 28-29mm with Grip and Professional Trigger Mechanism + Croco

HYBRID – For 28–29 mm Tubes with Professional Trigger System and Stainless Steel Accessories

HYBRID Speargun – Compactness, Precision, and Versatility in a Streamlined Body

The HYBRID model is the perfect balance of compact design, maneuverability, and performance. Developed to provide maximum customization freedom, it allows you to build your speargun to the desired length, with a barrel of your choice in aluminum or carbon fiber, and a solid wood rear stock, equipped with a high-precision professional trigger system.

Featuring a modern yet balanced design, the HYBRID ensures excellent stability during shooting, delivering precise trajectories even during rapid movements. The included triple-hole muzzle accommodates up to two pairs of 16 mm bands, allowing for adjustable power based on your spearfishing style.

Designed to meet the needs of both beginners and experienced divers, the HYBRID stands out thanks to its ergonomic handle, ensuring a secure and comfortable grip even during extended fishing sessions.

Hybrid Structure: Barrel + Wood

The barrel inserts into the wooden body and can be secured with two pins, bonded using epoxy resin or two-part adhesives. Included are Ø25 mm sealing blocks with dual O-ring grooves, machinable from solid stock or 3D printed, to prevent water intrusion near the pin area.

The wooden housing is compatible with barrels featuring an offset of 2.30 mm, the most widely used standard for speargun tubes.

The lower part of the stock includes a mounting base for the reel, designed for both vertical and horizontal configurations. Additionally, it s roller setups via seamless integration with the Croco system and reel mount, included in the DXF files with technical drawings for proper bending and assembly.

3D Model of Speargun and Handle

The design is optimized for CNC milling in exotic hardwoods such as teak, iroko, and mahogany. The package includes .STEP and .STL files for each component, compatible with both 3D printing and machining in Delrin or glass-filled nylon.

Included DXF Files for Laser Cutting and CNC

The package includes:

• Professional trigger mechanism
• Action camera quick-release mount
• Mounting plates for handle and stock
• Croco system + Reel mount
• Anti-flood barrel sealing blocks
• Stainless steel technical plates

Each file comes with detailed technical drawings in PDF format, with step-by-step instructions for bending and assembly. DXF files are ideal for laser cutting in stainless steel or CNC machining in carbon fiber, perfect for flat parts that don’t require further forming.

Woodworking for the Speargun

The speargun body is intended for hardwood machining, using 3- or 4-flute tools specifically designed for wood. Using inappropriate tools may compromise the quality of the cut.

Technical tip: Use laminated s with 15 mm strips to better distribute internal stress and enhance overall structural stiffness.

Trigger System – Safety and Reliability

Machined with micron-level tolerances, the trigger mechanism ensures maximum operational safety and accuracy. Laser cutting must be performed by qualified technicians to maintain the precise geometry and prevent alignment issues or misfires.

Recommended materials for internal components:

• AISI 316 (excluding 316L)
• AISI 316Ti
• AISI 420
• AISI 440C
• AISI 630

Warning Use of AISI 304 (18/10 or 18/8) is strongly discouraged due to its low hardness and poor mechanical wear resistance.

Stress test: The system has successfully withstood a static load of 280 kg for 48 consecutive hours with no failure.

Recommended Band Configurations

• 2 pairs of bands with 15–17 mm diameter
• Or: 3 pairs of 14 mm bands for faster release configurations

Handle Finishing and Assembly

The handle can also be made from Delrin or glass-filled nylon. In this case, it is recommended to:

• Avoid using epoxy resins
• Use polyurethane adhesive (Class D4)
• Sand with 40-grit to create deep grooves for strong adhesion

Included Package Contents

3D Files (.STEP, .STL)

• Speargun body
• Handle (Size M–L)
• Handle and stock plates
• Triple-band muzzle
• Croco tensioners + Reel mount
• Trigger system
• Barrel anti-flood blocks
• Action camera mount

Technical Drawings (PDF)

• Trigger system + action camera
• Croco tensioners + reel mount
• Stainless steel plates for handle and stock

Let me know if you'd like this turned into a product brochure, manual, or web content as well.

3D Printing Instructions for Muzzle and Barrel anti-flood blocks

• Infill: 100% (solid structure, no internal cavities)
• Enclosed print chamber required

• Recommended materials:

  • ASA
  • PA6-CF
  • PA6-GF30
  • PA12-CF
  • PEEK

Reinforced Nylon Test Results:

• PA6-GF15 (1.21–1.27 g/cm³): final weight approx. 270–280 g
• PA6-GF30 (1.35–1.45 g/cm³): final weight approx. 290–300 g

Recommended CNC Materials

Nylon (PA)

Type	Density (g/cm³)	Key Features
PA6	1.13	Standard Nylon 6
PA6-CF	1.20–1.30	Carbon fiber reinforced
PA6-GF15	1.21–1.27	Reinforced with 15% glass fiber
PA6-GF30	1.35–1.45	Reinforced with 30% glass fiber
PA12	1.01	Low water absorption, floats in water
PA12-CF	1.00–1.10	Lightweight, dimensionally stable
PA46	1.20	High heat resistance
PA66	1.14	Standard Nylon 66

Note: PA12 is ideal for underwater use due to its low water absorption (0.25–0.3%) and its density being lower than seawater, making it buoyant.

Other Technical Materials

Delrin (POM)

• Delrin 150 / 100 / 527UV: 1.41 g/cm³
• Delrin 570 (glass fiber): 1.42 g/cm³

Teflon (PTFE)

• Teflon G (15–25% glass): ~1.50 g/cm³
• Teflon GF (glass + graphite): ~1.60 g/cm³
• Teflon C (25% carbon): ~1.55 g/cm³

Other Polymers

• ASA: ~1.07 g/cm³
• PEEK: ~1.30–1.32 g/cm³
• Polypropylene (PP): 0.89–0.91 g/cm³

Polypropylene (PP)

Excellent material for underwater use due to its lightness, buoyancy, and impact resistance.

Key Properties:

• Water absorption: almost zero (<0.03%)
• High flexibility and good wear resistance
• Difficult to adhere to the print bed (requires special adhesives or dedicated surfaces)
• Significant shrinkage and deformation during printing

Reinforced Variants:

• PP-CF: carbon fiber reinforced, very rigid but expensive
• PP-GF: glass fiber reinforced, more affordable and durable

However, reinforced nylon is recommended as the best compromise between cost, stiffness, and mechanical strength.

WARNING:
This project is intended for private and recreational use only.
ed under the domain LDpro3D, owned by Lombardo Davide.
Any commercial reproduction is strictly prohibited.
Violations will be prosecuted under the law.

Technical Note:
Specifications and parameters for laser cutting and CNC milling depend on the type of machine and the operator’s preferences.
Standardized settings cannot be provided without knowing the equipment used.