While reducing the clutter atop the Electronics Workbench, I ran off four more probe flange reinforcements, just so I’m ready for the next crunch:

They’re almost identical to the previous version, although I tweaked the taper to end slightly inside the cylindrical cup, thereby eliminating the coincident faces and leaving a minute rim that doesn’t matter:

Given that I’ve had the ‘scope for nigh onto two decades and have only broken one probe flange, I think four reinforcements will be a lifetime supply: with any luck, the scope will blow a capacitor before I do.
The OpenSCAD source code:
// Tek Scope Probe Flange // Ed Nisley KE4ZNU November 2013 //- Extrusion parameters must match reality! // Print with 2 shells and 3 solid layers ThreadThick = 0.20; ThreadWidth = 0.40; HoleWindage = 0.2; Protrusion = 0.1; // make holes end cleanly function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit); //---------------------- // Dimensions FlangeOD = 16.0; FlangeID = 8.75; FlangeThick = IntegerMultiple(1.25,ThreadThick); DiskOD = FlangeOD + 4*ThreadWidth; DiskThick = FlangeThick + 4*ThreadThick; NumSides = 8*4; //---------------------- // Useful routines module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2); FixDia = Dia / cos(180/Sides); cylinder(r=(FixDia + HoleWindage)/2, h=Height, $fn=Sides); } module ShowPegGrid(Space = 10.0,Size = 1.0) { Range = floor(50 / Space); for (x=[-Range:Range]) for (y=[-Range:Range]) translate([x*Space,y*Space,Size/2]) %cube(Size,center=true); } //---------------------- // Build it ShowPegGrid(); difference() { union() { translate([0,0,2*ThreadThick]) cylinder(r=DiskOD/2,h=DiskThick,$fn=NumSides); // cylinder around flange cylinder(r1=(DiskOD - 2*ThreadWidth)/2, // flange reinforcing plate r2=DiskOD/2, h=(2*ThreadThick + Protrusion), $fn=NumSides); } translate([0,0,(DiskThick - FlangeThick)]) // flange clearance PolyCyl(FlangeOD,2*FlangeThick,NumSides); translate([0,0,-DiskThick/2]) // probe nose clearance PolyCyl(FlangeID,2*DiskThick,NumSides); }