Cute barometer

thingiverse

The cute barometer relies on constant air pressure trapped inside a sealed jar. Print all pieces at 0.2 resolution or lower to avoid gaps between layers and filaments, ensuring the membrane enclosure remains airtight. If you have a low-quality printer, increasing the Extrusion multiplier factor to 1.1 may be helpful. Make a hole in the center of the "Barometer Lower Half" enclosure after printing, as it's left un-perforated for better print quality. Find a small jar (200-400cl) with its own sealing cap and make a hole large enough for the lower half tube to pass through. Glue the lower half to the jar cap using epoxy resin or thick glue that prevents air from escaping. When sealed, the air inside should only communicate with the lower half of the barometer enclosure. Make a rubber membrane from a rubber glove or a thick balloon and place it between the two halves of the enclosure. Secure the flange using M3x10 bolts and nuts. Insert a small piece of wire or a needle into the rooster's head using a soldering station or preheat with a lighter. Once assembled, hold the jar to see the needle move as the air inside expands and pushes the membrane upwards when heated. This test reveals whether everything is sealed properly. To set the scale to neutral position, open and re-close the jar cap on a day with 1013 hPa atmospheric pressure.