// F3DP study 2.0. Units: mm. Render F6, inspect, export STL.
// Educational geometry, not a machine profile. Check slicer preview.
part="body"; // body or lid
x=60; y=40; z=24; wall=2; clearance=0.3; lip=4;
assert(x>4*wall && y>4*wall && z>wall && clearance>=0 && clearance<wall);
if(part=="body") difference(){ cube([x,y,z]); translate([wall,wall,wall]) cube([x-2*wall,y-2*wall,z]); }
if(part=="lid") union(){ cube([x,y,wall]); translate([wall+clearance,wall+clearance,wall-0.1]) difference(){ cube([x-2*(wall+clearance),y-2*(wall+clearance),lip+0.1]); translate([wall,wall,-1]) cube([x-4*wall-2*clearance,y-4*wall-2*clearance,lip+2]); } }