Print recommendations:

• PETG ist most likely the best thanks to it's slight flexibility
• 0.1mm or 0.15mm layer height recommended due to the small hole the lube goes through
• 3 perimeters work great. 2 is probably maybe also enough.

Important:

Make sure your lube bottle has the same sort of lip as mine and check it's diameter as shown in the last picture.

If your printer's extrusion width is calibrated well enough the tube from the bottle will be a bit difficult to push into the hole. Just try pushing it in with pliers.
If it's too tight try improvising :)
I can also upload a version with a slightly wider/smaller hole if demanded (in the comments).

Features:

Just click it on or off in a lever-like motion

The little knobs on the ring thing are for better grip, you can sligthly hold them with your middle finger and thumb. 

First file has funny silly german text on it ("Schmierer 2000"), 2nd file is clean of any text.

My testing:

I put it on and off around 50 times to check it's durability, it survived the test perfectly well.

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If you like this thingamajig, please consider leaving a small tip :) kofi linked on my profile