Volcano classroom experiment

I made this volcano model using Blender, then modified it with Fusion to help teachers perform the classic classroom eruption experiment with vinegar and baking soda. It has a cup that screws into the volcano from the underside, which can be filled with baking soda to “charge” the experiment. Then, students can pour vinegar into the crater and watch as the chemical reaction causes the foam to rise up and out. The channel inside the volcano is tapered, mostly to prevent the need for supports, but with the neat side effect of serving as a nozzle of sorts for the reaction.

Note: Apologies for the poor print imagery, I've made renders to hopefully make up for it. My printed model was given away to a student before I thought to take good photos of it for Makerworld, so the only real-world images I could compile were lifted from a video sent to my partner back when it was fresh off the printer.

19/01 Update: I got some feedback that the thread is a little tight on some printers, so I've added a new STL called “cup-big-offset” which increases the clearance between the cup and volcano from 0.25mm to 0.4mm. This will create a looser fit, but hopefully allow a bit more printer leniency to make it easier to screw in. If your printer can manage it, I think the original will be best though - since you need a tight seal to force all the pressure upward during the reaction. There's also a new print profile which includes both cups, so you can choose which one suits you :)

If you'd like to modify, customise or sell this model, please check out my Patreon for parametric files and commerical license options.