Hi Tom,

My design ethos was to build a desktop machine with reasonable accuracy, it’s not a production machine but has been used regularly. It is a toy compare to many machines in this forum but it fits my criteria and works well. For a more robust machine I would add extra rails to the Y axis, and re design the X axis so the rails are forward facing and use stronger extrusion, probably a larger C channel. A more robust machine = heavier components = stronger frame = heavier machine etc etc, I had to decide at what point in the design process I had achieved my goals and stop developing / adding complexity. I only had to buy 2 machined parts that I was unable to make, but with a bit of redesign I could remove them to use just flat plate. 2 time around I would make improvesment but still end up with a very similar machine in size / capabilities. Sound like your machine will be similar but a little more robust.