diff --git a/include/ord/OpenRoad.hh b/include/ord/OpenRoad.hh
index c4d0817c2c4..62ecb50221c 100644
--- a/include/ord/OpenRoad.hh
+++ b/include/ord/OpenRoad.hh
@@ -227,6 +227,7 @@ class OpenRoad
   void write3Dbv(const std::string& filename);
   void write3Dbx(const std::string& filename);
   void read3DBloxBMap(const std::string& filename);
+  void check3DBlox();
 
   void readDb(std::istream& stream);
   void readDb(const char* filename, bool hierarchy = false);
diff --git a/src/OpenRoad.cc b/src/OpenRoad.cc
index 3db37af8b66..0a9b57c4ba4 100644
--- a/src/OpenRoad.cc
+++ b/src/OpenRoad.cc
@@ -493,7 +493,7 @@ void OpenRoad::read3Dbx(const std::string& filename)
 {
   odb::ThreeDBlox parser(logger_, db_, sta_);
   parser.readDbx(filename);
-  parser.check();
+  check3DBlox();
   db_->triggerPostRead3Dbx(db_->getChip());
 }
 
@@ -503,6 +503,16 @@ void OpenRoad::read3DBloxBMap(const std::string& filename)
   parser.readBMap(filename);
 }
 
+void OpenRoad::check3DBlox()
+{
+  if (db_->getChip() == nullptr) {
+    logger_->error(utl::ORD, 76, "No design loaded.");
+    return;
+  }
+  odb::ThreeDBlox checker(logger_, db_, sta_);
+  checker.check();
+}
+
 void OpenRoad::write3Dbv(const std::string& filename)
 {
   odb::ThreeDBlox writer(logger_, db_, sta_);
diff --git a/src/OpenRoad.i b/src/OpenRoad.i
index df619b86e54..5742d6e6800 100644
--- a/src/OpenRoad.i
+++ b/src/OpenRoad.i
@@ -376,6 +376,13 @@ read_3dblox_bmap_cmd(const char *filename)
   ord->read3DBloxBMap(filename);
 }
 
+void
+check_3dblox_cmd()
+{
+  OpenRoad *ord = getOpenRoad();
+  ord->check3DBlox();
+}
+
 void
 write_3dbv_cmd(const char *filename)
 {
diff --git a/src/OpenRoad.tcl b/src/OpenRoad.tcl
index d7910a4707c..205d07ab125 100644
--- a/src/OpenRoad.tcl
+++ b/src/OpenRoad.tcl
@@ -228,6 +228,14 @@ proc read_3dblox_bmap { args } {
   ord::read_3dblox_bmap_cmd $filename
 }
 
+sta::define_cmd_args "check_3dblox" {}
+
+proc check_3dblox { args } {
+  sta::parse_key_args "check_3dblox" args keys {} flags {}
+  sta::check_argc_eq0 "check_3dblox" $args
+  ord::check_3dblox_cmd
+}
+
 sta::define_cmd_args "write_db" {filename}
 
 sta::define_cmd_args "read_db" {[-hier] filename}
diff --git a/src/odb/test/BUILD b/src/odb/test/BUILD
index 30ae25f4bc4..d1ff827cd8f 100644
--- a/src/odb/test/BUILD
+++ b/src/odb/test/BUILD
@@ -145,6 +145,7 @@ COMPULSORY_TESTS = [
     "all_pins_placed1",
     "all_pins_placed2",
     "bterm_hier_create",
+    "check_3dblox",
     "check_routing_tracks",
     "create_blockage",
     "create_obstruction",
diff --git a/src/odb/test/CMakeLists.txt b/src/odb/test/CMakeLists.txt
index 4736460d9c2..f720fc41043 100644
--- a/src/odb/test/CMakeLists.txt
+++ b/src/odb/test/CMakeLists.txt
@@ -5,6 +5,7 @@ or_integration_tests(
     all_pins_placed1
     all_pins_placed2
     bterm_hier_create
+    check_3dblox
     check_routing_tracks
     create_blockage
     create_obstruction
diff --git a/src/odb/test/check_3dblox.ok b/src/odb/test/check_3dblox.ok
new file mode 100644
index 00000000000..7efb2e0f2ae
--- /dev/null
+++ b/src/odb/test/check_3dblox.ok
@@ -0,0 +1,12 @@
+[INFO ODB-0227] LEF file: data/../Nangate45/Nangate45_tech.lef, created 22 layers, 27 vias
+[INFO ODB-0227] LEF file: data/../Nangate45/fake_macros.lef, created 10 library cells
+[INFO ODB-0227] LEF file: data/../Nangate45/fake_bumps.lef, created 1 library cells
+[WARNING STA-1171] data/../Nangate45/fake_macros.lib line 32, default_max_transition is 0.0.
+[INFO ODB-0128] Design: fake_macros
+[INFO ODB-0131]     Created 10 components and 32 component-terminals.
+[INFO ODB-0133]     Created 12 nets and 24 connections.
+[WARNING ODB-0156] Found 1 overlapping chips
+[WARNING ODB-0151] Found 1 floating chip sets
+[WARNING ODB-0151] Found 2 floating chip sets
+Summary 7 / 7 (100% pass)
+pass
diff --git a/src/odb/test/check_3dblox.tcl b/src/odb/test/check_3dblox.tcl
new file mode 100644
index 00000000000..724eadaf1db
--- /dev/null
+++ b/src/odb/test/check_3dblox.tcl
@@ -0,0 +1,71 @@
+source "helpers.tcl"
+
+proc get_3dblox_marker_count { sub_category_name } {
+  set top_chip [[ord::get_db] getChip]
+  set category [$top_chip findMarkerCategory "3DBlox"]
+  if { $category == "NULL" } {
+    return 0
+  }
+  set sub_category [$category findMarkerCategory $sub_category_name]
+  if { $sub_category == "NULL" } {
+    return 0
+  }
+  return [$sub_category getMarkerCount]
+}
+
+# 1. Load clean design
+read_3dbx "data/example.3dbx"
+set db [ord::get_db]
+set top_chip [$db getChip]
+
+# Get design info
+set inst1 [$top_chip findChipInst "soc_inst"]
+lassign [$inst1 getLoc] x1 y1 z1
+set master1 [$inst1 getMasterChip]
+set w1 [$master1 getWidth]
+set h1 [$master1 getHeight]
+set t1 [$master1 getThickness]
+
+set inst2 [$top_chip findChipInst "soc_inst_duplicate"]
+
+# Verify it is clean initially
+check "Initial overlap count" { get_3dblox_marker_count "Overlapping chips" } 0
+check "Initial floating count" { get_3dblox_marker_count "Floating chips" } 0
+
+# 2. Test Partial Overlap
+# Move inst2 to partially overlap with inst1
+set p [odb::Point3D]
+$p set [expr $x1 + $w1 / 4] [expr $y1 + $h1 / 4] [expr $z1 + $t1 / 2]
+$inst2 setLoc $p
+
+check_3dblox
+check "Partial overlap detected" { get_3dblox_marker_count "Overlapping chips" } 1
+
+# 3. Test Touching (Stacked Exactly)
+# Place inst2 exactly on top of inst1
+$p set $x1 $y1 [expr $z1 + $t1]
+$inst2 setLoc $p
+
+check_3dblox
+check "Touching chips no overlap" { get_3dblox_marker_count "Overlapping chips" } 0
+check "Touching chips not floating" { get_3dblox_marker_count "Floating chips" } 0
+
+# 4. Test Vertical Gap (Floating)
+# Move inst2 slightly higher
+$p set $x1 $y1 [expr $z1 + $t1 + 1]
+$inst2 setLoc $p
+
+check_3dblox
+check "Vertical gap detected as floating" { get_3dblox_marker_count "Floating chips" } 1
+
+# 5. Test Multiple Floating Sets
+# Create another chip far away
+set inst3 [odb::dbChipInst_create $top_chip $master1 "inst3"]
+$p set [expr $x1 + 10 * $w1] [expr $y1 + 10 * $h1] $z1
+$inst3 setLoc $p
+
+check_3dblox
+# Should find 2 sets of floating chips (inst2 and inst3 are both separate from inst1)
+check "Multiple floating sets detected" { get_3dblox_marker_count "Floating chips" } 2
+
+exit_summary