Variable size Canning Funnel

thingiverse

There are countless designs for Mason Jar canning funnels out there. So what makes this one stand out? * Most designs I've come across are just a simple cone transitioning into a cylinder. I took it up a notch by incorporating a nice radius in the throat. A nod to chickenchuck040 goes out for the arc module (see attribution). * Where I live, Mason Jars and their lids can be quite pricey. Collecting commercial jars and purchasing replacement lids is a more cost-effective option. The sample STLs I've included are for the most commonly available jars – 67mm & 57mm throats. * Since commercial jars come in a wide range of throat sizes, my design is incredibly easy to resize. Using This Design The Canning Funnel was designed using OpenSCAD. It's a "customiser" that includes two variables used to adjust the size of the funnel to suit different commercial jar throat diameters: `JarThroatSize = 57;` `JarThroatDepth = 15;` The "JarThroatSize" defines the outer diameter of the throat, while the "JarThroatDepth" determines how far down into the jar the throat extends. The advantage is that the design automatically adjusts the size of all other funnel components. Bonus Features The design also includes a simple handle. I opted not to print it because I wanted to stack my funnels inside each other. However, there's an EnableHandle true/false switch to enable it. A word of warning: the handle works for the above throat sizes but breaks with very small and very large ones. The EnableHandle does not seem to get picked up in the Customizer. About Canning * I never recycle commercial jar lids. I highly recommend that you shouldn't either. Commercial, and Mason, lids are designed for single use only. Reusing lids risks air leaks and contamination. * Yes, the commercial jars are intended as single-use items. So technically not as robust as the Mason ones. I do a lot of high-pressure/temperature canning. And I've only had a couple of breakages over the years – they're free to replace. * If you're curious about where I source my commercial lids, I'd be happy to share the URL.