Calibrating my 3D printer stepper motor steps the 'right way?'

Let's face it. I don't have the money to buy a dial test indicator yet. All I have is a vernier caliper. All the tests I see on YouTube or Thingiverse involve printing a part and then measuring it, but this is potentially flawed as it doesn't factor in the shrinking of materials. I have had bad dimensional accuracy since I got a new motherboard for my 3D printer. I also wanted to tune it to 256 micro-steps, so I figured this was a good day to do this as it required a lot of time from my experience of troubleshooting my 3D printer.

As I saw many machining videos on YouTube, I always knew the only right way was to use a dial indicator. I never bothered trying to calibrate my printer motor steps correctly. I bumped into a comment on Thingiverse in which a random user was complaining about how printing a test cube or a test print that's 100 mm large is a waste of time and money and could be done using a vernier caliper. He also linked his test methodology in the comments but was using a dial indicator with a 25 mm shaft. I figured I could use the vernier caliper's stem the same way.

Here's the video of laser cutting of the parts

I used two clamps and a large paper clip to hold the calipers. It's not the best way to hold it that way, but that's all I have.

Vidoes of calibrating are below