I was thinking to make a 3d printer myself, and I never made one before. But I thought it would be nice to make something different. I came up with the idea to make a printer with a steel frame, because steel is cheaper than aluminium and I've never seen a steel printer in this size. After all it was a lot more diffecult than i thought it would be, though I learned a lot from this project.
I started to draw the printer in Solidworks, I used the dimensions from the UM2 and calculated what the dimensions would be if I made a double bed , I also made z axis with a maximum of 30cm distance.