Sanity check per-axis settings for size

Marlin/SanityCheck.h

@@ -1074,3 +1074,16 @@ static_assert(1 >= 0
   #endif
   , "Please select no more than one LCD controller option."
 );
+
+/**
+ * Require 4 or more elements in per-axis initializers
+ */
+constexpr float sanity_arr_1[] = DEFAULT_AXIS_STEPS_PER_UNIT,
+                sanity_arr_2[] = DEFAULT_MAX_FEEDRATE,
+                sanity_arr_3[] = DEFAULT_MAX_ACCELERATION;
+static_assert(COUNT(sanity_arr_1) >= XYZE, "DEFAULT_AXIS_STEPS_PER_UNIT requires 4 (or more) elements.");
+static_assert(COUNT(sanity_arr_2) >= XYZE, "DEFAULT_MAX_FEEDRATE requires 4 (or more) elements.");
+static_assert(COUNT(sanity_arr_3) >= XYZE, "DEFAULT_MAX_ACCELERATION requires 4 (or more) elements.");
+static_assert(COUNT(sanity_arr_1) <= XYZE_N, "DEFAULT_AXIS_STEPS_PER_UNIT has too many elements.");
+static_assert(COUNT(sanity_arr_2) <= XYZE_N, "DEFAULT_MAX_FEEDRATE has too many elements.");
+static_assert(COUNT(sanity_arr_3) <= XYZE_N, "DEFAULT_MAX_ACCELERATION has too many elements.");