The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

The New Hotness

  • Round Patio Table Feet

    For a round patio table, although you can’t tell from the picture:

    Round patio table feet - installed
    Round patio table feet – installed

    Also despite appearances, that’s 3D printed from clear-ish TPU, with its black appearance due to internal reflections from the leg’s dark interior.

    The original hard-white-plastic feet had eroded enough to let the aluminum legs scrape the deck paint:

    Round patio table feet - old vs new
    Round patio table feet – old vs new

    The only way to extract each old foot was to hack out a segment with a razor knife, after which it slid out easily.

    The ring around the top of the sections provides enough griptivity inside the leg to hold the foot in place:

    Round Patio Table Foot - solid model
    Round Patio Table Foot – solid model

    As with the TPU chains on the bike rack tray holder, I expect the compressed / bent segments will gradually relax inside the legs, but the feet ought not fall out in normal use.

    The OpenSCAD source code isn’t quite a one-liner, but it’s close:

    // Patio Table Foot - round legs
    // Ed Nisley - KE4ZNU
    // 2026-05-29
    
    include <BOSL2/std.scad>
    
    /* [Hidden] */
    
    ID = 0;
    OD = 1;
    LENGTH = 2;
    
    HoleWindage = 0.2;
    Protrusion = 0.01;
    NumSides = 4*3*2*4;
    Gap = 5.0;
    
    $fn=NumSides;
    
    PadOA = [8.0,1*INCH,3.0];
    
    SleeveOA = [13.0,21.7 - HoleWindage,12.0];
    
    Kerf = 2.5;
    
    
    //-----
    // Build it
    
    difference() {
      union() {
        tube(PadOA[LENGTH],od=PadOA[OD],id=PadOA[ID],anchor=BOTTOM) position(TOP)
          tube(SleeveOA[LENGTH],od=SleeveOA[OD],id=SleeveOA[ID],anchor=BOTTOM);
        up(PadOA[LENGTH] + SleeveOA[LENGTH] - 1.0)
          torus(d_maj=SleeveOA[OD],r_min=(PadOA[OD] - SleeveOA[OD])/2,anchor=TOP);
      }
      up(PadOA[LENGTH])
        for (a = [0,60,120])
          zrot(a)
            cuboid([PadOA[OD],Kerf,2*SleeveOA[LENGTH]],anchor=BOTTOM);
    }