MX-5 Miata NA Randall Cowl Bulkhead Intake - image

Files (4)

MX5_Intake_Bulkhead_Adapter-57mm.stl

STL

136.8 KB

MX5_Intake_Bulkhead_Adapter-63mm.stl

STL

136.8 KB

MX5_Intake_Bulkhead_Adapter-70mm.stl

STL

136.8 KB

MX5_Intake_Bulkhead_Adapter-76mm.stl

STL

136.8 KB

Print guidance estimate

Estimated from part metadata

Print cost & setup estimate

Planning numbers for filament, cost, time, and setup. Treat them as estimates until you confirm the file in your slicer.

4 model files

Typical selected file

15g

Based on 25% main infill for the largest likely-needed model file

Material cost

$0.35

Filament only at roughly $24/kg PETG / ASA

Print time

25m–42m

Uses 70 mm/s, 0.2 mm layers; verify supports in slicer

STL file	Role	Source size	PETG / ASA 20%	PETG / ASA 25%	100% solid	Recommendation
MX5_Intake_Bulkhead_Adapter-57mm.stl	Printable file	136.8 KB STL	13g $0.32	15g $0.35	32g $0.77	Ensure proper fitment with the stock airbox and piping before printing
MX5_Intake_Bulkhead_Adapter-63mm.stl	Printable file	136.8 KB STL	13g $0.32	15g $0.35	32g $0.77	Ensure proper fitment with the stock airbox and piping before printing
MX5_Intake_Bulkhead_Adapter-70mm.stl	Printable file	136.8 KB STL	13g $0.32	15g $0.35	32g $0.77	Ensure proper fitment with the stock airbox and piping before printing
MX5_Intake_Bulkhead_Adapter-76mm.stl	Printable file	136.8 KB STL	13g $0.32	15g $0.35	32g $0.77	Ensure proper fitment with the stock airbox and piping before printing

Saved setup guidance is used for material, infill, support, and per-file recommendation text; editable numbers are planning estimates only.

Mechanical/Functional

MX-5 Miata NA Randall Cowl Bulkhead Intake

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3DPrintedCarPart

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Description

This design is heavily inspired by danobrien's design which replaces the non-ABS washer bottle and uses it's bolt holes in the firewall. This is my own design as I required a smaller adapter to fit 57mm/2¼" piping to connect to the stock airbox. It's currently a work in progress but my prototype did fit perfectly (see image) but the larger sized adapters might need adjustments to clear the weld lines, so I've provided the FreeCAD project file. 57mm / 2¼" piping 63mm / 2½" piping 70mm / 2¾" piping 76mm / 3" piping

Compatible Cars

Mazda MX-5

Updated Jul 15, 2026

Originally published on thingiverse.com by Jacob Foster (Eunos) · License: CC BY-SA

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