Customizable Flanged Hole Reducer Adapter Insert

Turn any oversized hole into a neat, smaller pass-through with this parametric flanged reducer insert.It’s built in three functional zones:Front flange: covers rough edges and gives a clean finished lookPress-in insert: centers the part and guides it into the existing holeRetaining lip: adds a little “grab” to help the adapter stay seated once installedFully customizable fitEvery key dimension is adjustable in the Customizer / OpenSCAD parameters, so you can tune the fit for your exact project—panels, enclosures, printed parts, ducting, or any general pass-through for cables, tubing, screws, or hardware. Dial in the outer/inner diameters, heights, flange size, and lip geometry to match your material thickness and the amount of retention you want.Common usesPanel/enclosure hole reductionCable or tube pass-through / grommet-style insertBushing-like sleeve for hardwareClean edge finishing for cutouts (3D printed or CNC)Quick adapters for mismatched openingsPrinting tipsPrint flange-side d