diff --git a/src/main/java/baritone/process/BuilderProcess.java b/src/main/java/baritone/process/BuilderProcess.java
index 00d3831ce..deccf5041 100644
--- a/src/main/java/baritone/process/BuilderProcess.java
+++ b/src/main/java/baritone/process/BuilderProcess.java
@@ -58,6 +58,7 @@ import net.minecraft.util.math.*;
 import java.io.File;
 import java.io.FileInputStream;
 import java.util.*;
+import java.util.stream.Collectors;
 
 import static baritone.api.pathing.movement.ActionCosts.COST_INF;
 
@@ -482,7 +483,7 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
 
         Goal goal = assemble(bcc, approxPlaceable.subList(0, 9));
         if (goal == null) {
-            goal = assemble(bcc, approxPlaceable); // we're far away, so assume that we have our whole inventory to recalculate placeable properly
+            goal = assemble(bcc, approxPlaceable, true); // we're far away, so assume that we have our whole inventory to recalculate placeable properly
             if (goal == null) {
                 if (Baritone.settings().skipFailedLayers.value && Baritone.settings().buildInLayers.value && layer < realSchematic.heightY()) {
                     logDirect("Skipping layer that I cannot construct! Layer #" + layer);
@@ -586,14 +587,23 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
     }
 
     private Goal assemble(BuilderCalculationContext bcc, List<IBlockState> approxPlaceable) {
+        return assemble(bcc, approxPlaceable, false);
+    }
+
+    private Goal assemble(BuilderCalculationContext bcc, List<IBlockState> approxPlaceable, boolean logMissing) {
         List<BetterBlockPos> placeable = new ArrayList<>();
         List<BetterBlockPos> breakable = new ArrayList<>();
         List<BetterBlockPos> sourceLiquids = new ArrayList<>();
+        List<BetterBlockPos> flowingLiquids = new ArrayList<>();
+        Map<IBlockState, Integer> missing = new HashMap<>();
         incorrectPositions.forEach(pos -> {
             IBlockState state = bcc.bsi.get0(pos);
             if (state.getBlock() instanceof BlockAir) {
                 if (approxPlaceable.contains(bcc.getSchematic(pos.x, pos.y, pos.z, state))) {
                     placeable.add(pos);
+                } else {
+                    IBlockState desired = bcc.getSchematic(pos.x, pos.y, pos.z, state);
+                    missing.put(desired, 1 + missing.getOrDefault(desired, 0));
                 }
             } else {
                 if (state.getBlock() instanceof BlockLiquid) {
@@ -602,6 +612,8 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
                     if (!MovementHelper.possiblyFlowing(state)) {
                         // if it's a source block then we want to replace it with a throwaway
                         sourceLiquids.add(pos);
+                    } else {
+                        flowingLiquids.add(pos);
                     }
                 } else {
                     breakable.add(pos);
@@ -622,6 +634,18 @@ public final class BuilderProcess extends BaritoneProcessHelper implements IBuil
             return new JankyGoalComposite(new GoalComposite(toPlace.toArray(new Goal[0])), new GoalComposite(toBreak.toArray(new Goal[0])));
         }
         if (toBreak.isEmpty()) {
+            if (logMissing && !missing.isEmpty()) {
+                logDirect("Missing materials for at least:");
+                logDirect(missing.entrySet().stream()
+                          .map(e -> String.format("%sx %s", e.getValue(), e.getKey()))
+                          .collect(Collectors.joining("\n")));
+            }
+            if (logMissing && !flowingLiquids.isEmpty()) {
+                logDirect("Unreplaceable liquids at at least:");
+                logDirect(flowingLiquids.stream()
+                          .map(p -> String.format("%s %s %s", p.x, p.y, p.z))
+                          .collect(Collectors.joining("\n")));
+            }
             return null;
         }
         return new GoalComposite(toBreak.toArray(new Goal[0]));