diff --git a/crates/fj-core/src/core.rs b/crates/fj-core/src/core.rs
index 47336abcc..e1e65fc7d 100644
--- a/crates/fj-core/src/core.rs
+++ b/crates/fj-core/src/core.rs
@@ -2,7 +2,9 @@
 //!
 //! See [`Core`].
 
-use crate::{layers::Layers, validation::ValidationConfig};
+use crate::{
+    algorithms::approx::Tolerance, layers::Layers, validation::ValidationConfig,
+};
 
 /// An instance of the Fornjot core
 ///
@@ -10,6 +12,9 @@ use crate::{layers::Layers, validation::ValidationConfig};
 pub struct Core {
     /// The layers of data that make up the state of a core instance
     pub layers: Layers,
+
+    /// Default tolerance used for intermediate geometry representation
+    pub default_tolerance: Tolerance,
 }
 
 impl Core {
@@ -25,7 +30,13 @@ impl Core {
     }
 
     fn from_layers(layers: Layers) -> Self {
-        Self { layers }
+        let default_tolerance = Tolerance::from_scalar(0.001)
+            .expect("Tolerance provided is larger than zero");
+
+        Self {
+            layers,
+            default_tolerance,
+        }
     }
 }