Can XY skew be calibrated in software or firmware?

I just installed a Prusa i3 printer. With minimum adjustment and configuration, it is printing now. make some cubes and name tags for kids.
Very nice! Simple and fun!

I have read Z auto levering in the firmware. In my case manually adjust the bed is good enough for now. Actually, it is pretty easy to get the bed leveled by hand.
But after a few prints I noticed that XY is not squared because the nature of the design. YZ and XZ is OK because they do have square or triangle members to maintain the 90 degrees.

I have asked my buddy to CNC a 10mm thick rectangular acrylic block for me to put in the bottom to fix the XY skew.
I will get the block in a few days.
Yes, after happy printing for a couple of days, the printer is all apart now. LoL

At the same time I am thinking that somebody must have developed a tool in the firmware to fix the skew?

look up "orthogonal axis compensation" which should really be called "nonorthogonal axis compensation".

Using software to fix a mechanical error that should not exist is sort of silly. If X and Y are not orthogonal, fix the actual problem and make them orthogonal. It isn't hard to do, though it does take some time. Usually, you only have to do it once, unless your printer has two motors driving Z axis threaded rods.

See this: [www.youmagine.com]

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Ultra MegaMax Dominator 3D printer: [drmrehorst.blogspot.com]

Hey Mark

Thanks for the correct keywords for me to dig in.

Yes, yes, and yes. I 100% agree with you about fixing it mechanically first.
The reason why I bought this Prusa i3 is to design my own.
So I am collecting information and learning all sorts of things from this forum.

I designed my own desktop CNC machine from scratch, which is in production now.
I know what do "rigid" and "square" really mean. LoL

I am working with my workshop on an molded plastic frame based 3d printer plan. Not too fancy, not too accurate, but RELIABLE.

More questions are coming...