Case: 4.2 mm insert holes, M3x8 base screws with the feet

The 4.0 mm holes printed too tight for CNC Kitchen M3x5.7 inserts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

case/vfd-case.scad

@@ -55,14 +55,14 @@ win_r = 2;
 win_chamfer = 1.5;
 
 /* [Heat-set inserts, M3] */
-insert_d = 4.0;         // hole for the insert
+insert_d = 4.2;         // hole for the insert (CNC Kitchen M3x5.7; 4.0 printed too tight)
 insert_depth = 6;
 boss_d = 7;             // display bosses (larger would touch the glass)
 screw_d = 3.4;          // M3 clearance
 head_d = 6.2;           // M3 head counterbore in the base
 head_depth = 2;
 
-/* [TPU feet, held by the base screws (use M3x10 instead of M3x8)] */
+/* [TPU feet, held by the base screws (M3x8 still fits)] */
 foot_d = 14;            // fits inside the base outline at the rear corners
 foot_h = 4.5;           // below the base
 foot_spigot_h = 1.8;    // locates in the base's screw counterbore