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BackPreg_replace($re, '/', $abs, -1, $n)) { } else { rotate_extrude(convexity=10, $fn=fn4) polygon(points=[ [x0,y1],[x1,y1],[x2,y2],[x2,y3],[x1,y4],[x0,y4] ], paths=[ [0,1,2,3,4,5,6,7] ]); } else if ( fsh == 0 cylinder(h=chg, r=cord-cdp*smt/100, $fn=2*cfn, center=false); shape(fsh, cird, cord-cdp*smt/100, cfn*4, chg); module shape(hsh, ird, ord, fn4, hg y0=-0.1; y1=0; y2=abs(hsh); y3=hg-abs(hsh); y4=hg; y5=hg+0.1; if ( fsh == 0 cylinder(h=chg, r=cord-cdp*smt/100, $fn=2*cfn, center=false); shape(fsh, cird, cord-cdp*smt/100, cfn*4, chg); knurled_finish(cord, cird, clf, csh, cfn, crn); else if ( hsh >= 0 ) { // replace the