Adding some notes from video on lubrication

calibration.html

@@ -82,6 +82,8 @@
         <p>If your printer has a motion system based on V-roller wheels riding on V-slot extrusions, check they are properly tensioned. Each location will have one eccentric nut. This can be twisted to either add or remove tension on the wheels.</p>
         <p><b>If the wheels are too loose:</b> Wobble will be present in the assembly, which will show in the print as surface artefacts.</p>
         <p><b>If the wheels are too tight:</b> The assembly will be too tense, which will wear the V-rollers prematurely.</p>
+        <h4>Lubrication</h4>
+        <p>Lubrication is an important maintenance task to perform regularly.  Use <a href="https://amzn.to/3aqLT0a" target="_blank">SuperLube Synthetic Grease<</a>.  Lubrigation needs to be performed regularly on any harden rods, <a href="https://www.youtube.com/watch?v=loBHYcifzRM" target="_blank">linear rails</a> and lead screws.</p>
         <h4>Bed Levelling</h4>
         <p>Probably the most essential part of setting up your 3D printer. Most new users will trip up on this. If you have ABL, this includes making sure your Z offset has been set and saved. My method is included in the above video and this diagram is a handy reference:</p>
         <a href="#" data-featherlight="img/firstlayer.jpg"><img class="thumb" src="img/firstlayer.jpg" /></a>