Rigid Square Tube All Metal Frame for DIY Projects 3D Printer Metal Frame Furniture

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Update 30/03/2016: I've added this design to Sketchfab for easier 3D viewing: https://skfb.ly/MB6I. Because I couldn't find aluminum profiles suitable for such projects in my area, and because I knew that even in Western Europe, many places still lack T-slot/V-slot ALU extrusions, I thought about using the next best thing: ALU/Steel square tubes found in hardware stores. After searching online, I discovered that all connectors are typically made of plastic, 3D printed, or bought from the same hardware store supplying the tubes (which is usually ABS). I didn't like that. I wanted an all-metal sturdy frame capable of holding tools, vibrations (like a 3D printer), or its own weight (furniture: cabinets, etc.). I also sought a solution that can be easily scaled up without changing the layout of existing patterns, whatever partition one would like to create. My solution involves two types of tubes (two patterns of holes) to overcome this dilemma: 1. Tubes with 4 holes at each end, two+two for receiving the two threaded legs of U-bolts. 2. Tubes with only one hole at each end, a hole that will receive the bolt that the U-Bolt will lock to when fastened. The hardware needed includes: Steel/Alu tubes in two lengths (L1,L2). Long U-Bolts that fit inside the tube, flush with its face and length that would allow it to span the square dimension and the distance from the hole to the edge of the profile. I used an M4 threaded U-bolt in my design. Nuts for the U-Bolts (M4 in my design). M5 bolt + Nut for the U-bolt's stopper. M5 Hex Coupler of a length that would clamp the U-Bolt to the tube's face. This can be either a cut-to-length Hex Coupler or a similar length stack of Washers and/or Nuts. Note: The need for the hex coupler is dictated by the fact that without it, the tube is free to move on the bolt's direction. This might not be a practical issue once the U-Bolts are fastened with locknuts but just to be on the safe side and to accommodate the higher precision needed by machinery like a 3D printer for example. This setup doesn't allow any tube to rotate around its axis or translate along any of his edges; it should be like a single piece of metal carved out from a block. I've uploaded both an STL to exemplify (with a nice exploded view of one of the planes) and the RSDOC file I used to build the CAD of the design. You can download and use for free the DesignSpark Mechanical to visualize that one or modify or play with it as you please. If you know of or have an even simpler solution that can be scaled to as many partitions as one needs, keeping the number of individual parts as low as possible, please let me know.