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Brake Fluid Cap (Nissan)

Brake Fluid Cap (Nissan) preview

Files (3)

brake_fluid_cap.stl
STL
94.8 KBPrimary file
brake_fluid_cap_tall.stl
STL
112.7 KB
brake_fluid_tall.stl
STL
112.7 KB

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Recommended filament for this print

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Referenced itemWhat to verifyPrice & availability
PETG filamentAmazon · Affiliate linkAmazon product page for 1.75 mm PETG; confirm colour, spool size, print temperature, seller, and delivery region.Check price at Amazon
ASA filamentAmazon · Affiliate linkAmazon product page for 1.75 mm ASA; use an enclosure and suitable ventilation, and confirm seller and regional availability.Check price at Amazon

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License & use

CC BY
Commercial use allowed
Attribution required
Safety/IP review

The file license permits commercial reuse, subject to any applicable attribution or share-alike terms. License status does not verify vehicle fitment, OEM rights, design patents, or safety.

BM

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Description

Nissan Leaf's Aerodynamics require a floor of fiberglas below the motor/drivetrain. I was replacing my brake fluid today and dropped the cap down beyond the point of no return. I wasn't going to take the whole bottom off the car just for a little plastic cap. I couldn't find a cap that would fit so I measured it out. 34mm widest point, 28mm cylinder around the top. This is designed to screw onto the existing threads. I found the part for $13 on Nissan's website, but hey, 3D printer. Here's the source model for adjusting: https://www.tinkercad.com/things/7JAe1vDGpbW-brake-fluid-cap/edit My first prototype (that seemed to work after re-shaping), had no grip so I added edges, as well as adjusting the measurements slightly. #Safety Warning It was brought to my attention that brake fluid is very sensitive to moisture. Having just 2-4% H2O moisture in fluid changes the freezing and boiling temperature of the fluid. See moisture related brake failures, I recommend spraying the underside of the cap with Flex Seal or another alternative that gives the cap a water tight seal when twisted tight. Anybody who has printed a cup should know prints can't hold out any kind of liquid. Don't run this cap for more than a few days without some sort of seal. This would be a great temporary cap but shouldn't be trusted for long term use.

Compatible Vehicles

Published Jun 27, 2026Updated Oct 30, 2026

Originally published on thingiverse.com by brandon martin (blandman512) · License: CC BY

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