diff --git a/vlib/v/ast/types.v b/vlib/v/ast/types.v
index 35ec0fc56a..f6b27dc502 100644
--- a/vlib/v/ast/types.v
+++ b/vlib/v/ast/types.v
@@ -1395,9 +1395,9 @@ fn (t Table) shorten_user_defined_typenames(originalname string, import_aliases
 		}
 		// types defined by the user
 		// mod.submod.submod2.Type => submod2.Type
-		if res.count('[') < 2 {
-			mut parts := res.split('.')
-			if parts.len > 1 {
+		mut parts := res.split('.')
+		if parts.len > 1 {
+			if parts[..parts.len - 1].all(!it.contains('[')) {
 				ind := parts.len - 2
 				if t.is_fmt {
 					// Rejoin the module parts for correct usage of aliases
@@ -1408,9 +1408,9 @@ fn (t Table) shorten_user_defined_typenames(originalname string, import_aliases
 				}
 
 				res = parts[ind..].join('.')
-			} else {
-				res = parts[0]
 			}
+		} else {
+			res = parts[0]
 		}
 	}
 	return res
diff --git a/vlib/v/gen/c/auto_str_methods.v b/vlib/v/gen/c/auto_str_methods.v
index 424ee99b18..9161137890 100644
--- a/vlib/v/gen/c/auto_str_methods.v
+++ b/vlib/v/gen/c/auto_str_methods.v
@@ -142,7 +142,7 @@ fn (mut g Gen) final_gen_str(typ StrType) {
 			g.gen_str_for_fn_type(sym.info, styp, str_fn_name)
 		}
 		ast.Struct {
-			g.gen_str_for_struct(sym.info, styp, str_fn_name)
+			g.gen_str_for_struct(sym.info, styp, g.table.type_to_str(typ.typ), str_fn_name)
 		}
 		ast.Map {
 			g.gen_str_for_map(sym.info, styp, str_fn_name)
@@ -151,10 +151,11 @@ fn (mut g Gen) final_gen_str(typ StrType) {
 			g.gen_str_for_multi_return(sym.info, styp, str_fn_name)
 		}
 		ast.SumType {
-			g.gen_str_for_union_sum_type(sym.info, styp, str_fn_name)
+			g.gen_str_for_union_sum_type(sym.info, styp, g.table.type_to_str(typ.typ),
+				str_fn_name)
 		}
 		ast.Interface {
-			g.gen_str_for_interface(sym.info, styp, str_fn_name)
+			g.gen_str_for_interface(sym.info, styp, g.table.type_to_str(typ.typ), str_fn_name)
 		}
 		ast.Chan {
 			g.gen_str_for_chan(sym.info, styp, str_fn_name)
@@ -343,7 +344,7 @@ fn (mut g Gen) gen_str_for_enum(info ast.Enum, styp string, str_fn_name string)
 	g.auto_str_funcs.writeln('}')
 }
 
-fn (mut g Gen) gen_str_for_interface(info ast.Interface, styp string, str_fn_name string) {
+fn (mut g Gen) gen_str_for_interface(info ast.Interface, styp string, typ_str string, str_fn_name string) {
 	$if trace_autostr ? {
 		eprintln('> gen_str_for_interface: ${info.types} | ${styp} | ${str_fn_name}')
 	}
@@ -352,16 +353,7 @@ fn (mut g Gen) gen_str_for_interface(info ast.Interface, styp string, str_fn_nam
 	g.auto_str_funcs.writeln('static string ${str_fn_name}(${styp} x) { return indent_${str_fn_name}(x, 0); }')
 	g.definitions.writeln('static string indent_${str_fn_name}(${styp} x, int indent_count); // auto')
 	mut fn_builder := strings.new_builder(512)
-	mut clean_interface_v_type_name := styp.replace('__', '.')
-	if styp.ends_with('*') {
-		clean_interface_v_type_name = '&' + clean_interface_v_type_name.replace('*', '')
-	}
-	if clean_interface_v_type_name.contains('_T_') {
-		clean_interface_v_type_name =
-			clean_interface_v_type_name.replace('Array_', '[]').replace('_T_', '[').replace('_', ', ') +
-			']'
-	}
-	clean_interface_v_type_name = util.strip_main_name(clean_interface_v_type_name)
+	clean_interface_v_type_name := util.strip_main_name(typ_str)
 	fn_builder.writeln('static string indent_${str_fn_name}(${styp} x, int indent_count) { /* gen_str_for_interface */')
 	for typ in info.types {
 		sub_sym := g.table.sym(ast.mktyp(typ))
@@ -404,7 +396,7 @@ fn (mut g Gen) gen_str_for_interface(info ast.Interface, styp string, str_fn_nam
 	g.auto_fn_definitions << fn_builder.str()
 }
 
-fn (mut g Gen) gen_str_for_union_sum_type(info ast.SumType, styp string, str_fn_name string) {
+fn (mut g Gen) gen_str_for_union_sum_type(info ast.SumType, styp string, typ_str string, str_fn_name string) {
 	$if trace_autostr ? {
 		eprintln('> gen_str_for_union_sum_type: ${info.variants} | ${styp} | ${str_fn_name}')
 	}
@@ -419,20 +411,11 @@ fn (mut g Gen) gen_str_for_union_sum_type(info ast.SumType, styp string, str_fn_
 		variant_names := info.variants.map(util.strip_main_name(g.table.sym(it).name))
 		clean_sum_type_v_type_name = '${variant_names.join('|')}'
 	} else {
-		clean_sum_type_v_type_name = styp.replace('__', '.')
-		if styp.ends_with('*') {
-			clean_sum_type_v_type_name = '&' + clean_sum_type_v_type_name.replace('*', '')
-		}
-		if clean_sum_type_v_type_name.contains('_T_') {
-			clean_sum_type_v_type_name =
-				clean_sum_type_v_type_name.replace('Array_', '[]').replace('_T_', '[').replace('_', ', ') +
-				']'
-		}
-		clean_sum_type_v_type_name = util.strip_main_name(clean_sum_type_v_type_name)
+		clean_sum_type_v_type_name = util.strip_main_name(typ_str)
 	}
 	fn_builder.writeln('\tswitch(x._typ) {')
 	for typ in info.variants {
-		typ_str := g.typ(typ)
+		typ_name := g.typ(typ)
 		mut func_name := g.get_str_fn(typ)
 		sym := g.table.sym(typ)
 		sym_has_str_method, str_method_expects_ptr, _ := sym.str_method_info()
@@ -443,7 +426,7 @@ fn (mut g Gen) gen_str_for_union_sum_type(info ast.SumType, styp string, str_fn_
 
 		// str_intp
 		if typ == ast.string_type {
-			mut val := '${func_name}(${deref}(${typ_str}*)x._${sym.cname}'
+			mut val := '${func_name}(${deref}(${typ_name}*)x._${sym.cname}'
 			if should_use_indent_func(sym.kind) && !sym_has_str_method {
 				val += ', indent_count'
 			}
@@ -454,7 +437,7 @@ fn (mut g Gen) gen_str_for_union_sum_type(info ast.SumType, styp string, str_fn_
 			}))'
 			fn_builder.write_string('\t\tcase ${typ.idx()}: return ${res};\n')
 		} else {
-			mut val := '${func_name}(${deref}(${typ_str}*)x._${sym.cname}'
+			mut val := '${func_name}(${deref}(${typ_name}*)x._${sym.cname}'
 			if should_use_indent_func(sym.kind) && !sym_has_str_method {
 				val += ', indent_count'
 			}
@@ -827,7 +810,7 @@ fn (g &Gen) type_to_fmt(typ ast.Type) StrIntpType {
 	return .si_i32
 }
 
-fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, str_fn_name string) {
+fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, typ_str string, str_fn_name string) {
 	$if trace_autostr ? {
 		eprintln('> gen_str_for_struct: ${info.parent_type.debug()} | ${styp} | ${str_fn_name}')
 	}
@@ -840,15 +823,7 @@ fn (mut g Gen) gen_str_for_struct(info ast.Struct, styp string, str_fn_name stri
 		g.auto_fn_definitions << fn_builder.str()
 	}
 	fn_builder.writeln('static string indent_${str_fn_name}(${styp} it, int indent_count) {')
-	mut clean_struct_v_type_name := styp.replace('__', '.')
-	if clean_struct_v_type_name.contains('_T_') {
-		// TODO: this is a bit hacky. styp shouldn't be even parsed with _T_
-		// use something different than g.typ for styp
-		clean_struct_v_type_name =
-			clean_struct_v_type_name.replace('Array_', '[]').replace('_T_', '[').replace('_', ', ') +
-			']'
-	}
-	clean_struct_v_type_name = util.strip_main_name(clean_struct_v_type_name)
+	clean_struct_v_type_name := util.strip_main_name(typ_str)
 	// generate ident / indent length = 4 spaces
 	if info.fields.len == 0 {
 		fn_builder.writeln('\treturn _SLIT("${clean_struct_v_type_name}{}");')
diff --git a/vlib/v/tests/inout/printing_nested_generic_struct.out b/vlib/v/tests/inout/printing_nested_generic_struct.out
new file mode 100644
index 0000000000..fa343f1159
--- /dev/null
+++ b/vlib/v/tests/inout/printing_nested_generic_struct.out
@@ -0,0 +1,80 @@
+{'one': 1, 'two': 2}
+[Tuple2[int, Tuple2[string, int]]{
+    a: 0
+    b: Tuple2[string, int]{
+        a: 'one'
+        b: 1
+    }
+}, Tuple2[int, Tuple2[string, int]]{
+    a: 1
+    b: Tuple2[string, int]{
+        a: 'two'
+        b: 2
+    }
+}]
+[Tuple2[int, Tuple2[Tuple2[string, int], Tuple2[int, string]]]{
+    a: 0
+    b: Tuple2[Tuple2[string, int], Tuple2[int, string]]{
+        a: Tuple2[string, int]{
+            a: 'one'
+            b: 1
+        }
+        b: Tuple2[int, string]{
+            a: 1
+            b: 'one'
+        }
+    }
+}, Tuple2[int, Tuple2[Tuple2[string, int], Tuple2[int, string]]]{
+    a: 1
+    b: Tuple2[Tuple2[string, int], Tuple2[int, string]]{
+        a: Tuple2[string, int]{
+            a: 'two'
+            b: 2
+        }
+        b: Tuple2[int, string]{
+            a: 2
+            b: 'two'
+        }
+    }
+}]
+{3: 'three', 4: 'four'}
+[Tuple2[int, Tuple2[int, string]]{
+    a: 0
+    b: Tuple2[int, string]{
+        a: 3
+        b: 'three'
+    }
+}, Tuple2[int, Tuple2[int, string]]{
+    a: 1
+    b: Tuple2[int, string]{
+        a: 4
+        b: 'four'
+    }
+}]
+[Tuple2[int, Tuple2[Tuple2[int, string], Tuple2[string, int]]]{
+    a: 0
+    b: Tuple2[Tuple2[int, string], Tuple2[string, int]]{
+        a: Tuple2[int, string]{
+            a: 3
+            b: 'three'
+        }
+        b: Tuple2[string, int]{
+            a: 'three'
+            b: 3
+        }
+    }
+}, Tuple2[int, Tuple2[Tuple2[int, string], Tuple2[string, int]]]{
+    a: 1
+    b: Tuple2[Tuple2[int, string], Tuple2[string, int]]{
+        a: Tuple2[int, string]{
+            a: 4
+            b: 'four'
+        }
+        b: Tuple2[string, int]{
+            a: 'four'
+            b: 4
+        }
+    }
+}]
+[]Tuple2[int, Tuple2[string, int]]
+[]Tuple2[int, Tuple2[Tuple2[string, int], Tuple2[int, string]]]
diff --git a/vlib/v/tests/inout/printing_nested_generic_struct.vv b/vlib/v/tests/inout/printing_nested_generic_struct.vv
new file mode 100644
index 0000000000..79619fe22c
--- /dev/null
+++ b/vlib/v/tests/inout/printing_nested_generic_struct.vv
@@ -0,0 +1,55 @@
+struct Tuple2[A, B] {
+	a A
+	b B
+}
+
+// map to array of Tuple2[int, Tuple2[key, value]] tuples
+fn map_to_array_int_kv[K, V](m map[K]V) []Tuple2[int, Tuple2[K, V]] {
+	mut r := []Tuple2[int, Tuple2[K, V]]{cap: m.len}
+	mut i := 0
+	for k, v in m {
+		r << Tuple2[int, Tuple2[K, V]]{i, Tuple2[K, V]{k, v}}
+		i += 1
+	}
+	return r
+}
+
+// map to array of Tuple2[int, Tuple2[Tuple2[key, value], Tuple2[value, key]]] tuples
+fn map_to_array_int_kv_vk[K, V](m map[K]V) []Tuple2[int, Tuple2[Tuple2[K, V], Tuple2[V, K]]] {
+	mut r := []Tuple2[int, Tuple2[Tuple2[K, V], Tuple2[V, K]]]{cap: m.len}
+	mut i := 0
+	for k, v in m {
+		r << Tuple2[int, Tuple2[Tuple2[K, V], Tuple2[V, K]]]{i, Tuple2[Tuple2[K, V], Tuple2[V, K]]{Tuple2[K, V]{k, v}, Tuple2[V, K]{v, k}}}
+		i += 1
+	}
+	return r
+}
+
+fn main() {
+	x := {
+		'one': 1
+		'two': 2
+	}
+	y := {
+		3: 'three'
+		4: 'four'
+	}
+
+	println(x)
+	rx1 := map_to_array_int_kv(x)
+	println(rx1)
+	rx2 := map_to_array_int_kv_vk(x)
+	println(rx2)
+
+	println(y)
+	ry1 := map_to_array_int_kv(y)
+	println(ry1)
+	ry2 := map_to_array_int_kv_vk(y)
+	println(ry2)
+
+	// test typeof(X).name
+	zx1 := []Tuple2[int, Tuple2[string, int]]{}
+	println(typeof(zx1).name)
+	zx2 := []Tuple2[int, Tuple2[Tuple2[string, int], Tuple2[int, string]]]{}
+	println(typeof(zx2).name)
+}
diff --git a/vlib/v/tests/printing_c_structs/string_interpolation_test.v b/vlib/v/tests/printing_c_structs/string_interpolation_test.v
index 2ea40d63d7..69d0712fba 100644
--- a/vlib/v/tests/printing_c_structs/string_interpolation_test.v
+++ b/vlib/v/tests/printing_c_structs/string_interpolation_test.v
@@ -19,7 +19,7 @@ fn test_interpolation_of_v_structs_containing_c_structs() {
 	}
 	sxxx := xxx.str()
 	assert sxxx == 'VStruct{
-    a_c_struct: struct Abc{
+    a_c_struct: C.Abc{
         char_pointer_field: &C"the string"
     }
 }'
diff --git a/vlib/v/tests/str_gen_test.v b/vlib/v/tests/str_gen_test.v
index dff13a12f6..21f49f87cd 100644
--- a/vlib/v/tests/str_gen_test.v
+++ b/vlib/v/tests/str_gen_test.v
@@ -458,7 +458,7 @@ fn test_c_struct_typedef() {
 		}
 		assert c.str() == r'CTypeDefStruct{
     mutex: &sync.Mutex{
-        mutex: pthread_mutex_t{}
+        mutex: C.pthread_mutex_t{}
     }
 }'
 	}