JerrycanCaps

Lost or broke your jerrycan cap? Just print a new one with my generic 3D design.

Disclaimer

Let's begin with the obvious part: fuel is flammable. Any leak can thus become a hazard. Due to print and material qualities, I can not guarantee that my design is leak free and strong enough in your particular setup. Even if the cap does not leak when tested, over time it might still develop a leak. Always obey the maximum fill line of the jerrycan, store the jerrycan so that the cap is not touching the liquid, and never store a jerrycan filled with fuel in an enclosure which is not ventilated to the outside.

Software

This 3D design file is made by FreeCAD. You need this free open source program to configure the dimensions of your Jerrycan Cap.

Dimensions

In the FreeCAD file is a spreadsheet. The following entries, all in millimeters, need to be edited:

• Diameter. This is the diameter of the filler neck of the jerrycan, excluding the (male) thread.
• Thread. This is the depth of the thread. This can not be more than half of the Pitch.
• Pitch. This is the pitch of the thread. This is the distance between two adjacent "ridges".
• Heigth. This is the height of the threaded part of the filler neck of the Jerrycan.

Materials

Please do not use PLA. It can not deal with long term exposure to fuel, UV, and temperatures above 40 degrees Celsius.

Cap

I use PETG for this, as it is a bit flexible, can withstand UV, does not react with fuels and additives, and can deal with temperatures up to 65 degrees Celsius.

If you plan to have the jerrycan permanently exposed to the sun, I recommend to print the cap with ABS/ASA instead.

Dry the filament before use to obtain the correct strength.

I used the default settings of my slicer software, i.e. 2 walls, 15% infill. Stronger is not necessarily better: in my design I rely on the cap to be a little bit flexible, so it adjusts to small angle deviations of the filler neck.

Gasket

Although I added a spring like construction in the inside of the cap, for minor unevenesses you probably want to add some sort of gasket.

You can either cut a piece of rubber sheet with the correct diameter, or print my "Gasket" design. If you cut it from a piece of rubber, make a small hole in the middle so it fits over the pilar in the middle. This serves to retain the gasket.

If you print the gasket, use TPU for this. I used TPU95 and that proved to be adequate. Anything else than TPU is not an improvement over the cap itself.

Holder

Obviously, this is an optional part, to prevent the cap from becoming lost when the jerrycan is opened. I used TPU95 for this.