Perpetual calendar mechanical meter

cults3d

I wanted to develop a mechanical calendar solution that I initially imagined to be made up of a multitude of gears before finally being inspired by a mechanical counter mechanism such as the one used by hostesses to recount the number of passengers. After many prototypes and some complete design reversals, here is a functional mechanical calendar solution that can be realized with your 3D printer. The date is incremented by simply pressing the "One More Day" pedal. The month is incremented either on the 30th or the 31st depending on the length of the month. A small drawback of this mechanism is that it does not handle the special case of the month of February. So you'll have to press the pedal 3 times to go from February 28th to March 1st (or twice on February 29th if the year is leap year!). The mechanism consists of 15 parts made in 3D printing to which you will have to add : 2 nails of diameter 3.1 mm x length 70 mm 2 nails of diameter 3.1 mm x length 70 mm cut to 35 mm 2 elastic bracelets (desk elastic type for backrest) 2 wood / chipboard screws diameter 2.5 mm x length 16 mm For the assembly of this calendar, please also consider : Sandpaper Oil (e.g. bicycle chain oil) A 3.5 mm diameter drill bit to take up the bores, especially of the selector and the hooks guided by the nails The proper functioning of the calendar depends on the sliding of the selectors and cams, so the surfaces in contact will have to be sanded before being lubricated in order to reduce the roughness induced by 3D printing. You can also customize the housing and pedal of this meter from the following files : https://cults3d.com/en/3d-model/gadget/pedale-et-boitier-personnalisable-pour-compteur-calendrier-mecanique Here is a link to a first video that will give you first information on the assembly procedure. https://youtu.be/ERKXG97c4Sg I offer this model at a reduced price for the first daredevils who venture to make it. I have only had the opportunity to print this model on my Alfawise U20, as the relative size of the parts determines how well the mechanism works. It is likely that the length of one of the selectors needs to be adjusted. If you notice a malfunction, please let me know in a commentary so that I can suggest a variant of the appropriate selector switch. I have already added a shortcut selector in the updated file. Design update V125 : Addition of an assembly manual Increase the angle of the arms by 2° to make sure that the hook falls back into the next notch. Adding a shortened version of the month and/or day selector by 0.5 mm