Fixed typo

calibration.html

@@ -1171,7 +1171,7 @@ <h5>Tools:</h5>
         <p>The speed at which our 3D printer (or any CNC machine) moves is better described as 'feedrate'. Like any speed measurement, it is a calculation of distance travelled over time. In 3D printing, the most common feedrate units are mm/sec and mm/min.</p>
         <p>Most of the time, we want to print as fast as possible, at least up to the point where print quality deteriorates beyond our personal threshold.</p>
         <h2>Surface artefacts related to feedrate</h2>
-        <p>Some printers may have a combination of hardware and software that produces noise or surface artefacts with feedate as a factor. This is the case for the image submitted by midicdj1000, where a chnge in feedrate for the outer walls alters the pattern on this surface:</p>
+        <p>Some printers may have a combination of hardware and software that produces noise or surface artefacts with feedate as a factor. This is the case for the image submitted by midicdj1000, where a change in feedrate for the outer walls alters the pattern on this surface:</p>
         <a href="#" data-featherlight="img/speedartefacts.jpg"><img loading="lazy" class="thumb" src="img/speedartefacts.jpg" /></a>
         <p>The test on this page is therefore useful for finding an ideal feedrate for outer wall surface quality.</p>
         <h2>Feedrate limitations from the extruder drive and hot end</h2>