diff --git a/src/ansys/api/acp/VERSION b/src/ansys/api/acp/VERSION
index d8f69e2..9e557de 100644
--- a/src/ansys/api/acp/VERSION
+++ b/src/ansys/api/acp/VERSION
@@ -1 +1 @@
-0.1.0.dev3
+0.1.0.dev4
diff --git a/src/ansys/api/acp/v0/solid_model.proto b/src/ansys/api/acp/v0/solid_model.proto
new file mode 100644
index 0000000..da86fe6
--- /dev/null
+++ b/src/ansys/api/acp/v0/solid_model.proto
@@ -0,0 +1,102 @@
+syntax = "proto3";
+package ansys.api.acp.v0.solid_model;
+
+import "ansys/api/acp/v0/base.proto";
+import "ansys/api/acp/v0/enum_types.proto";
+
+enum ExtrusionMethodType {
+    ANALYSIS_PLY_WISE = 0;
+    MONOLITHIC = 1;
+    PRODUCTION_PLY_WISE = 2;
+    MODELING_PLY_WISE = 3;
+    SPECIFY_THICKNESS = 4;
+    MATERIAL_WISE = 5;
+    USER_DEFINED = 6;
+    SANDWICH_WISE = 7;
+}
+
+enum DropOffType {
+    INSIDE_PLY = 0;
+    OUTSIDE_PLY = 1;
+}
+
+enum OffsetDirectionType {
+    SHELL_NORMAL = 0;
+    SURFACE_NORMAL = 1;
+    // DISTORTION_CONTROLLED -> not supported at the moment
+}
+
+message DropOffSettings {
+    DropOffType drop_off_type = 1;
+    bool disable_dropoffs_on_bottom = 2;
+    repeated base.ResourcePath dropoff_disabled_on_bottom_sets = 3;
+    bool disable_dropoffs_on_top = 4;
+    repeated base.ResourcePath dropoff_disabled_on_top_sets = 5;
+    bool connect_butt_joined_plies = 6;
+}
+
+message ExportSettings {
+    bool use_default_section_index = 1;
+    int32 section_index = 2;
+    bool use_default_coordinate_system_index = 3;
+    int32 coordinate_system_index = 4;
+    bool use_default_material_index = 5;
+    int32 material_index = 6;
+    bool use_default_node_index = 7;
+    int32 node_index = 8;
+    bool use_default_element_index = 9;
+    int32 element_index = 10;
+    bool use_solsh_elements = 11;
+    bool write_degenerated_elements = 12;
+    bool drop_hanging_nodes = 13;
+    bool use_solid_model_prefix = 14;
+    bool transfer_all_sets = 15;
+    repeated base.ResourcePath transferred_element_sets = 16;
+    repeated base.ResourcePath transferred_edge_sets = 17;
+}
+
+message Properties {
+    // general properties
+    enum_types.StatusType status = 1; // read only
+    bool locked = 2;                  // read only
+    bool active = 3;
+    repeated base.ResourcePath element_sets = 4;
+    ExtrusionMethodType extrusion_method = 5;
+    double max_element_thickness = 6;
+    repeated base.ResourcePath ply_group_pointers = 7;
+    OffsetDirectionType offset_direction = 8;
+    base.ResourcePath drop_off_material = 9;
+    base.ResourcePath cut_off_material = 10;
+    bool delete_bad_elements = 11;
+    double warping_limit = 12;
+    double minimum_volume = 13;
+    // drop off properties
+    DropOffSettings drop_off_settings = 14;
+    // export properties
+    ExportSettings export_settings = 15;
+}
+
+message ObjectInfo {
+    base.BasicInfo info = 1;
+    Properties properties = 2;
+}
+
+message ListReply { repeated ObjectInfo objects = 1; }
+
+message CreateRequest {
+    base.CollectionPath collection_path = 1;
+    string name = 2;
+    Properties properties = 3;
+}
+
+service ObjectService {
+    rpc List(base.ListRequest) returns (ListReply);
+
+    rpc Get(base.GetRequest) returns (ObjectInfo);
+
+    rpc Put(ObjectInfo) returns (ObjectInfo);
+
+    rpc Delete(base.DeleteRequest) returns (base.Empty);
+
+    rpc Create(CreateRequest) returns (ObjectInfo);
+}