plunger: increase sprue thickness to 1.0 mm for resin minimum

plunger.scad

@@ -23,7 +23,7 @@ module plunger() {
 
 SPRUE_GAP  = 2.0;                       // gap between adjacent flanges
 SPRUE_PITCH = FLANGE_D + SPRUE_GAP;     // centre-to-centre
-SPRUE_T    = 0.5;                        // bridge thickness — snaps cleanly
+SPRUE_T    = 1.0;                        // bridge thickness — 1.5mm meets resin min
 SPRUE_Z    = FLANGE_T + 0.4;            // just above the flange shoulder
 SPRUE_OVL  = 0.2;                        // overlap into each shaft so shells merge