Added more images of ikea lack tower concrete slab

input/projects/3d-printing/ikea-lack.md

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 And it works perfectly, the noise of the printer is greatly reduced!
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+Here are some more photos of the second slab I made.
+
+<div class="lightgallery">
+    <a href="img/ikea_lack_concrete_v2_1.jpg">
+        <img src="img/ikea_lack_concrete_v2_1_small.jpg" alt="">
+    </a>
+    <a href="img/ikea_lack_concrete_v2_2.jpg">
+        <img src="img/ikea_lack_concrete_v2_2_small.jpg" alt="">
+    </a>
+    <a href="img/ikea_lack_concrete_v2_3.jpg">
+        <img src="img/ikea_lack_concrete_v2_3_small.jpg" alt="">
+    </a>
+    <a href="img/ikea_lack_concrete_v2_4.jpg">
+        <img src="img/ikea_lack_concrete_v2_4_small.jpg" alt="">
+    </a>
+    <a href="img/ikea_lack_concrete_v2_5.jpg">
+        <img src="img/ikea_lack_concrete_v2_5_small.jpg" alt="">
+    </a>
+</div>