diff --git a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/JogPanel.java b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/JogPanel.java
index da68bdd58..c81acc68b 100644
--- a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/JogPanel.java
+++ b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/JogPanel.java
@@ -24,10 +24,9 @@
  */
 public class JogPanel extends JPanel {
 	private static final Logger logger = LoggerFactory.getLogger(JogPanel.class);
-	
-	private static final long serialVersionUID = -7408469373702327861L;
-	private Plotter myPlotter;
-	private CartesianButtons bCartesian = new CartesianButtons();
+
+	private final Plotter myPlotter;
+	private final CartesianButtons bCartesian = new CartesianButtons();
 	private JButton toggleEngageMotor;
 	private JButton findHome;
 	private JButton penUp;
diff --git a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPanel.java b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPanel.java
index 3af25804e..d9adddf71 100644
--- a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPanel.java
+++ b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPanel.java
@@ -1,7 +1,6 @@
 package com.marginallyclever.makelangelo.plotter.plottercontrols;
 
 import com.marginallyclever.communications.NetworkSessionEvent;
-import com.marginallyclever.communications.NetworkSessionListener;
 import com.marginallyclever.convenience.CommandLineOptions;
 import com.marginallyclever.makelangelo.Translator;
 import com.marginallyclever.util.PreferencesHelper;
@@ -84,10 +83,6 @@ public MarlinPanel(ChooseConnection chooseConnection) {
 		});
 	}
 
-	public void addNetworkSessionListener(NetworkSessionListener a) {
-		chatInterface.addNetworkSessionListener(a);
-	}
-
 	private void onConnect() {
 		logger.debug("MarlinInterface connected.");
 		setupNetworkListener();
@@ -123,8 +118,11 @@ private void onTimeoutCheck() {
 	private void setupNetworkListener() {
 		chatInterface.addNetworkSessionListener(this::onDataReceived);
 	}
-	
-	// This does not fire on the Swing EVT thread.  Be careful!  Concurrency problems may happen.
+
+	/**
+	 * This does not fire on the Swing EVT thread.  Be careful!  Concurrency problems may happen.
+	 * @param evt the network session event
+	 */
 	protected void onDataReceived(NetworkSessionEvent evt) {
 		if (evt.flag == NetworkSessionEvent.DATA_RECEIVED) {
 			lastReceivedTime = System.currentTimeMillis();
diff --git a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPlotterPanel.java b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPlotterPanel.java
index 9438c21f1..37267d296 100644
--- a/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPlotterPanel.java
+++ b/src/main/java/com/marginallyclever/makelangelo/plotter/plottercontrols/MarlinPlotterPanel.java
@@ -3,16 +3,14 @@
 import com.marginallyclever.communications.NetworkSessionEvent;
 import com.marginallyclever.convenience.ColorRGB;
 import com.marginallyclever.convenience.Point2D;
-import com.marginallyclever.convenience.helpers.StringHelper;
 import com.marginallyclever.convenience.W3CColorNames;
+import com.marginallyclever.convenience.helpers.StringHelper;
 import com.marginallyclever.makelangelo.plotter.Plotter;
 import com.marginallyclever.makelangelo.plotter.PlotterEvent;
 import com.marginallyclever.makelangelo.plotter.plottersettings.PlotterSettings;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.Serial;
-
 /**
  * {@link MarlinPlotterPanel} is a {@link MarlinPanel} with extra
  * instructions for interaction with a plotter robot.
@@ -21,15 +19,14 @@
  * @since 7.28.0
  */
 public class MarlinPlotterPanel extends MarlinPanel {
-	@Serial
-	private static final long serialVersionUID = -7114823910724405882L;
-
 	private static final Logger logger = LoggerFactory.getLogger(MarlinPlotterPanel.class);
 
 	private static final String STR_FEEDRATE = "echo:  M203";
 	private static final String STR_ACCELERATION = "echo:  M201";
 	private static final String MOTOR_ENGAGE = "M17";
 	private static final String MOTOR_DISENGAGE = "M18";
+
+	// M665 Set delta/polargraph configuration.
 	private static final String M665 = "M665";
 
 	private final Plotter myPlotter;
@@ -125,6 +122,10 @@ private void sendSizeUpdate() {
 				+" H"+StringHelper.formatDouble(maxLen));
 	}
 
+	/**
+	 * This does not fire on the Swing EVT thread.  Be careful!  Concurrency problems may happen.
+	 * @param evt the network session event
+	 */
 	@Override
 	protected void onDataReceived(NetworkSessionEvent evt) {
 		super.onDataReceived(evt);