Parametric Grommet
Description
This is a general purpose grommet, but it was inspired by the various firewall grommets encountered in automotive applications. More specifically those encountered with old British sports car firewalls. You can also make a hole plug with this as well. Some British cars would have a control cable running through the grommet. I've added the feature to add a supporting central boss for these types of cases Set TORUSBIGDIAMETER to the diameter of the hole the grommet must fit into. SHEETTHICK is the thickness of the slot in the grommets and should be a tad thicker than the sheet metal you are mounting this into Print in TPU and you should have a grommet that will last a very long time. It is unavoidable but you will have some support in the groove to clean out in post processing.
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