Hello Stratmaster
I like your design with al the metal parts that are milled and the proffesional look!
It's is true what you say, because of the use of just 1 ballscrew at one side, you have a lot of ineartia at the other side. This side misses a linear motion and has to react on the movement of the other side. That takes a little bit of time (for this machine it won't be much, but when you are talking about a longer version = longer axes, the problem will be bigger and bigger), so when you want to have a fast movement, the side that has no ballbearing will not be moving at same speeds and the same time as the side where the ballbearing will be.
This results in wobbly axes and an much fewer accuracy in your printed/milled product. As said, I don't think this will be so much with this small version, but you have to consider this.
The longer axes will have this more and more I suspect.
The axes can also jam when moving to fast or with much direction changes, that will cause a lot of faulty products.... And possibly broken parts or burned motors.
So within a few cycles it won't be square anymore for this version (you could theoretically make the construction as rigid as possible, but the reality learns that you never have bearings and parts that are precisely manufactured, so you would miss the precision), but also a greater version would prefer ballbearings at both sides.
Don't let my reaction scare you away from your idea, I just want you to know what happens when you take this idea to a greater machine.
But as we say here, trying and learning is the best way to make a product. And there are always some rocks on the way to get there, but if it was easy it would not be much of fun!
I am curious to your test run!
Keep on the good work
Regards,
Geert