Smoking bacon during the winter months brought the third tank into play, requiring the POL-to-QD adapter I’d had in the drawer for just such an occasion. Not much to my surprise, the old PLA fitting adapter snapped along the layers near the outside end of the triangular snout:
So I ran off the two orange ones in PETG with six perimeter layers and 50% infill density:
Those should last roughly forever …
The OpenSCAD source code as a GitHub Gist:
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| // Propane tank QD connector adapter tool | |
| // Ed Nisley KE4ZNU November 2012 | |
| // 2018-04-08 toss MCAD includes overboard | |
| //- Extrusion parameters must match reality! | |
| // Print with about half a dozen perimeter threads and 50% infill | |
| ThreadThick = 0.25; | |
| ThreadWidth = 2.0 * ThreadThick; | |
| HoleWindage = 0.2; | |
| function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit); | |
| Protrusion = 0.1; // make holes end cleanly | |
| inch = 25.4; | |
| //---------------------- | |
| // Dimensions | |
| WrenchSize = (5/8) * inch; // across the flats | |
| WrenchThick = 10; | |
| NoseDia = 8.6; | |
| NoseLength = 9.0; | |
| LockDia = 12.5; | |
| LockRingLength = 1.0; | |
| LockTaperLength = 1.5; | |
| TriDia = 15.1; | |
| TriWide = 12.2; // from OD across center to triangle side | |
| TriOffset = TriWide - TriDia/2; // from center to triangle side | |
| TriLength = 9.8; | |
| NeckDia = TriDia; | |
| NeckLength = 4.0; | |
| //---------------------- | |
| // 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... | |
| $fn = 4*6; | |
| //ShowPegGrid(); | |
| union() { | |
| translate([0,0,(WrenchThick + NeckLength + TriLength - LockTaperLength - LockRingLength + Protrusion)]) | |
| cylinder(r1=NoseDia/2,r2=LockDia/2,h=LockTaperLength); | |
| translate([0,0,(WrenchThick + NeckLength + TriLength - LockRingLength)]) | |
| cylinder(r=LockDia/2,h=LockRingLength); | |
| difference() { | |
| union() { | |
| translate([0,0,WrenchThick/2]) | |
| cube([WrenchSize,WrenchSize,WrenchThick],center=true); | |
| cylinder(r=TriDia/2,h=(WrenchThick + NeckLength +TriLength)); | |
| cylinder(r=NoseDia/2,h=(WrenchThick + NeckLength + TriLength + NoseLength)); | |
| } | |
| for (a=[-1:1]) { | |
| rotate(a*120) | |
| translate([(TriOffset + WrenchSize/2),0,(WrenchThick + NeckLength + TriLength/2 + Protrusion/2)]) | |
| cube([WrenchSize,WrenchSize,(TriLength + Protrusion)],center=true); | |
| } | |
| } | |
| } |
The Smell of Molten Projects in the Morning 