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MX5 AC Delete HVAC Pipe and bungs - image

Files (5)

AC_Drain_Bung.STL
STL
233.9 KB
AC_Fire_Wall_Bung_Large.STL
STL
261.1 KB
AC_Fire_Wall_Bung_Small_v2.STL
STL
229.1 KB
HVAC_Ducting_Sqr.STL
STL
451.9 KB
HVAC_Ducting_Tri.STL
STL
483.5 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.
5 model files
Typical selected file
28g

Based on 40% main infill for the largest likely-needed model file

Material cost
$0.68

Filament only at roughly $24/kg PETG / ASA

Print time
48m–1.3h

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

STL fileRoleSource sizePETG / ASA 20%PETG / ASA 40%100% solidRecommendation
AC_Drain_Bung.STLPrintable file233.9 KB STL
16g
$0.39
22g
$0.52
38g
$0.92
Ensure proper fit and orientation in the slicer before printing
AC_Fire_Wall_Bung_Large.STLPrintable file261.1 KB STL
17g
$0.40
22g
$0.54
40g
$0.95
Ensure proper fit and orientation in the slicer before printing
AC_Fire_Wall_Bung_Small_v2.STLPrintable file229.1 KB STL
16g
$0.38
21g
$0.52
38g
$0.91
Ensure proper fit and orientation in the slicer before printing
HVAC_Ducting_Sqr.STLPrintable file451.9 KB STL
20g
$0.49
27g
$0.66
49g
$1.16
Ensure proper fit and orientation in the slicer before printing
HVAC_Ducting_Tri.STLPrintable file483.5 KB STL
21g
$0.50
28g
$0.68
50g
$1.20
Ensure proper fit and orientation in the slicer before printing

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

Mechanical/Functional

MX5 AC Delete HVAC Pipe and bungs

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Description

Part of removing the crumbling AC system from a 1995 NA MX5 involves removing the evaporator box from behind the dash. You can buy a replacement part to connect up the blower housing to the heater core, but where is the fun in that? This is a work in progress as only designed the ducting, I am yet to print and test fit the parts. Edit 22/04/2022, Uploaded the CAD models of the Ducts but I am yet to print them, so no idea if they fit or not. I have also draw up some bungs to plug the holes left by removing the box. One of them is for the box drain pipe, secured by a cable tie. And the other 2 push into the rubber grommets in the firewall. This is for the RHD version of the car, I believe (but cannot confirm) it is different for the LHD version. I have printed the Bungs in PetG due to close proximity to hot engine parts.

Compatible Cars

Published Jun 27, 2026Updated Jul 15, 2026

Originally published on thingiverse.com by Tim Taylor (timmyisasleep) · License: CC BY

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