Bracket mount gasket - Blender Geometry Nodes parametric
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Parametric gasket and washer for mounting a bracket against a wall - fully parametric in Blender - for you to experiment
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I needed electrically isolating gaskets and washers to fix powder-coated mild steel brackets against a brick wall, using stainless steel rawl bolts. Mild steel in contact with stainless steel, in a salt-spray corrosive coastal environment leads to galvanic corrosion, hence the need for electrical isolation.
As an experiment, the design was made in Blender 5, using Geometry Nodes for a non-destructive parametric design: you can change the dimensions with sliders in the Geometry Nodes network. This was a first attempt at such a design, to be printed in TPU (also a first).
Blender's Geometry Nodes is well-described on the Internet and will not be covered here. Points worthy of notice are:
The Group Input object mesh appears in the final STL export. This can be prevented by feeding the Group Input geometry into a 'Delete Geometry' node
When combining meshes, the 'Join Geometry' node joins the meshes logically, but not geometrically into a manifold mesh: instead use the 'Mesh Boolean' node to form a union of the two meshes.
To exploit common parameter inputs in different objects (i.e., the gasket and the washer) create the separate objects separately, both feeding to a 'Join Geometry' before feeding out into the Group Output node. This creates a logical combination of objects, but as separate meshes. When exported to STL, the logical objects' meshes are exported as separate meshes, to be split up into separate object meshes in the slicer.
The application is for a weight-bearing bracket, hence the model was printed with 100% infill. The eSun TPU95A at max volumetric speed of 2.5 mm3/s worked fine, but at 230 degC there was a small amount of stringing.
The blender file for this design was uploaded with the .txt file type/extension (Printables does not recognise the .blend file type), just rename the file to remove the .txt extension.