Everything has pros and cons, so if you are also in the bottle-feeding game, you will probably spend quite some efforts for bottle-hygiene.
Keeping track of time is part of it, and you may have found yourself in the situation having several bottles of milk on the table, but first of all not knowing anymore which one is the youngest, and mainly not knowing how old even the recent milk is! Still fine or down the drain? The struggle is real..
Anyway, help is on the way:
A slide-on time dial ring with a sliding window to select the time you prepared the milk or other content and prevents you from forgetting exactly that time a minute later!
At least for us a real game-changer :)
I designed it for baby bottles by Nuk, more precisely the small and large bottle of the “Perfect Match” series, but probably will fit other models as well. → Leave a comment if you find a suitable model/brand, then I can tag it for others!
The Nuk bottle has a diameter of approx. 57mm and a slight concave outline, which helps to keep the ring in place. However, I added indents for little pieces of rubbery/foamy adhesive tape to prevent slipping (the small black pieces in the picture).
Print one ring, and use it for several bottles by easily sliding it on and off from the bottom of the bottle.
An interlock-kind-of thing keeps both end of the ring together and provides decent stiffness when attached to a bottle. This moving part prints-in-place and works great for me with the given print settings. (If the movement is sluggish, consider removing any bad leftovers from the free-hanging layers of the bottom of the inside, see picture. I used a knife to scratch it off and then it was moving like charme.)
The sliding window is a secondary part to print. Make sure you print in the direction as given in the screenshot to obtain best stability. I printed 3 copies, 100%, 99& and 98% scaled (X- and Y only) to find a convenient sliding resistance. For attachment just bend open the ring a little and the slide on next to the interlock.
Other than that, for me it makes sense to print the ring in a bright color to be able to paint the scale and number with a black marker. I chose black for the sliding window.
Print settings:
0.4mm nozzle
0.12 mm layer height for better number and scale details and precise interlock.
PETG or anything flexible. PLA will probably break when flexing.
NO SUPPORT NEEDED
Consider mouse ear brim, as full brim is a hassle to remove from the inner face of the ring.
100% infill via enough wall count. I I think I chose 5 walls. This helps a lot to create a nice but strong flex.
Have fun!
I'm happy about comments and suggestions
The author marked this model as their own original creation.