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Garden Knife Sheath
This replaces the transparent acrylic version that’s sure to resurface in the garden:

Garden Knife Sheath – solid model The ends have nice chamfered entrances made from octagons:

Garden Knife Sheath – entrances – solid model The thing went away so fast I didn’t get a chance to photograph it, but magenta PETG filament should make it much harder to mislay, out there among the greenery…
The OpenSCAD source code:
// Garden Knife Scabbard // Ed Nisley KE4ZNU - August 2015 //- Extrusion parameters - must match reality! ThreadThick = 0.25; ThreadWidth = 0.40; function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit); Protrusion = 0.1; HoleWindage = 0.2; //------ // Dimensions WallThick = IntegerMultiple(3.0,ThreadWidth); Blade = [115,1.8,16.0]; Clearance = [10.0,2.0,2.0]; Slot = Blade + Clearance; Sheath = Slot + [0,2*WallThick,2*WallThick]; //- Build it translate([0,0,Sheath[2]/2]) difference() { union() { for (i=[-1,1]) translate([i*Sheath[0]/2,0,-Sheath[2]/2]) rotate(180/32) cylinder(d=Sheath[1],h=Sheath[2],$fn=32); cube(Sheath,center=true); } cube(Slot + [Slot[0],0,0],center=true); for (i=[-1,1]) translate([i*(Sheath[0]/2 + Sheath[1]/2),0,-Slot[2]/2]) rotate(180/8) cylinder(d=Sheath[1] - 4*ThreadWidth,h=Slot[2],$fn=8); }