Werkzeuge & Geräte

Nipple Caps for Grease, Air and Brake: STL Files

This collection gathers printable caps that close off grease fittings, air tank fill ports and hydraulic bleed nipples. Most are small parts that use little material, so they are easy to batch on a 3D printer. The variety matters more than the size: some are rigid covers, others are made in a flexible filament to grip the fitting. Polyzon does not confirm whether models are free, their price, license, official status, affiliation, safety or fitness. Check the current terms at the source.

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Auswahlregeln: Polyzon-Redaktion · Text aktualisiert: 13.10.2026

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«Nipple Caps for Grease, Air and Brake: STL Files»

The models fall into a few groups. Caps for grease fittings are usually simple domes or shallow cups, sometimes with a small tail that keeps them attached. Fill port covers for air tanks and paintball regulators often need a tighter fit because they sit against pressure during filling. Caps for hydraulic brake bleed screws are smaller still and are frequently printed in a flexible material so they stay on the screw.

On the author's page, look at the stated inner and outer diameter and compare it with the fitting you have, since one part name covers several thread standards. Check how many parts the model includes and whether they snap or screw together. Read the material and layer settings the author lists, and look at photos of real prints to judge how the cap sits. If a cap has to stretch over a ridge, a stiff filament may crack.

Search terms differ from field to field, so try the wording used in each one: grease fitting, zerk cover, fill port plug, bleed screw cap, valve cap. Adding the device helps, for example bicycle, scooter, air rifle, paintball marker or brake caliper. Related items include dust covers, tools for removing the valve itself, and small organizers that hold caps and spare parts together.

FAQ

Häufige Fragen

What size should a nipple cap be printed at?
The size depends on the fitting, not on the model name. Measure the outer diameter of the nipple or the thread, then compare it with the dimensions the author gives on the model page.
Which filament works for these caps?
Rigid caps are often printed in the usual stiff materials, while caps that must stretch over a ridge are usually made in a flexible filament. The author's page often names the material used for the shown print.
Do these caps need supports?
Many are short, open shapes that print without them, but taller or hollow versions may need support inside. Check the orientation shown in the author's photos.
Can one cap be used for brakes and grease fittings?
Not usually. Brake bleed screws, grease fittings and air fill ports differ in diameter and thread, so a cap made for one rarely fits another. Compare the listed dimensions before printing.
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