Merge pull request #4537 from thinkyhead/rc_fix_some_flaws

Patch up some flaws here and there

Marlin/SanityCheck.h

@@ -184,6 +184,15 @@
   #endif
 #endif
 
+/**
+ * Delta requirements
+ */
+#if ENABLED(DELTA)
+  #if DISABLED(USE_XMAX_PLUG) && DISABLED(USE_YMAX_PLUG) && DISABLED(USE_ZMAX_PLUG)
+    #error "You probably want to use Max Endstops for DELTA!"
+  #endif
+#endif
+
 /**
  * Babystepping
  */