Leg Extension for Vertex K8400

After making quite a few modification to my Vertex K8400 (added 2nd power supply for heatbead, added mainboard cover, etc.) I realized that the gap between the parts added to the bottom of the printer and the desk top is too small. So, I decided to raise the printer by extending its legs. I replaced the original corner pieces with Things published here.

Here is the BOM:
- 16 M5x16mm screws to attach parts to printer's side panels
- 4 M5x20mm screws to attach Part 2 to the bottom panel
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