This is a replacement grommet for a Sears swamp cooler. I've made it fully parametric so you should be able to use it for about any type of appliance with a relatively thin skin of metal on the outside.
The Sears cooler has two holes or ports on the side to allow for cabling and other access. In my case, these two holes are not used. The cooler came with two plugs made of a soft plastic that have long since rotted away from sun exposure and other environmental factors. Seemed like an ideal thing to print so I designed this part.
I printed this without any supports and it worked fine on my Solidoodle.
This part uses the Pie Slice Library so you will need to download that file and put it in the same directory (or change the 'use'). Thanks to ex-nerd for making that great library available.
Lots of config parameters at the top. The comments there should give you enough info to adjust the part to your needs.
There are a couple of useful routines in this file that you could use in other projects. First is the 'torus' module that creates something like an o-ring type shape based on the inside and outside diameters. Very handy to create lips and such.
Second is the 'ring' module that creates essentially a hollow cylinder. Again, this could be useful for lots of projects that need some sort of 'tube'.