Parametric rocket coupler sleeve & AV Bay maker

A fully parametric coupler sleeve and avionics bay (AV bay) generator for model and high power rocketry. Use it as a simple tube coupler with shear pins and a stop ring, or enable bulkheads, all-thread rod holes, arming switch cutout, altimeter static ports, and ejection charge wells to build a complete electronics sled housing — all driven by the OpenSCAD Customizer.

Coupler Sleeve Both

• 14 built-in tube presets
• Independent upper/lower shoulders
• Configurable fit and clearance
• Centre stop ring
• Shear pin holes (2–8)

Keyed Orientation Both

• Ridge key (external ridge)
• D-flat key (chord slice)
• Configurable key angle
• One-way insertion only
• Aligns switch holes and wiring

AV Bay Bulkheads AV Bay

• Forward and aft bulkhead discs
• Eyebolt or U-bolt recovery holes
• All-thread rod bolt circle
• Ejection charge wells with wire holes
• Wire pass-through for avionics

Electronics Access AV Bay

• Arming switch hole (circle or slot)
• Altimeter static pressure ports
• Configurable position and angle
• Assembled preview or print layout

How It Works

As a coupler: The sleeve slides into two airframe tube sections to join them. The stop ring seats against the tube ends to set the depth, and shear pins hold the joint until a deployment charge fires.

As an AV bay: Enable the bulkheads to create a self-contained electronics bay. Two bulkhead discs are threaded onto all-thread rods and clamped with nuts. The electronics (altimeter, battery, arming switch) mount between the bulkheads on the rods or a sled. The coupler sleeve slides over the assembly and into the airframe. Charge wells on the outward faces of each bulkhead hold the ejection charges. Stepped bulkheads include a centering shoulder that slides into the coupler bore for precise alignment. The larger flange sits against the sleeve end and is clamped by all-thread rods. In print layout, stepped bulkheads are oriented with the step on the build plate and the charge well facing up.

D-flat keying: The D-flat key slices a flat chord off one side of the sleeve, creating an asymmetric cross-section. When the airframe tube has a matching flat filed into it (or a shim glued in), the coupler can only be inserted in one orientation. This ensures the arming switch, altimeter ports, and shear pin holes always align correctly.