Went to pick up my cheap box section 100mm x 60mm and it was bent, so left it. But got 2 pieces of RSJ 160mm x 90mm x 7mm x 2000mm for £20 on ebay and local for pick up. I've done a few more workings on my last design, but as there were no replies, it's probably no good. Am i going backwards in my design, i have an idea in covering the 2 outside ball screws using tumble dryer venting duct and curtain wire, it might work.

All the red/brown areas are 40mm x 40mm steel box section, that is reasonably priced. All the ali is 20mm except for the motor mounts where i have used 10mm, milled to 3mm for clearance.

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The screw lengths and rail lengths are still as quoted a couple of posts ago. I have at the moment got 1610 on the Z, reading through some other posts it seems i would be better with 1605 on Z, is that correct. Also I'm looking at going with 1:1 ratio with pulleys, would that be OK.

If i have made a big mistake with this design, please let me know. If you want the file to check it out, I'm willing to send it. I'm itching to place an order with chai.