<p>So basically I've been having a problem with my Micro+.
It will not level / calibrate itself and I can't fix it. The reason I'm here is that I've been using Cura, and somehow it destroyed my bed. (See image)</p>
<p><a href="https://i.stack.imgur.com/Qe8cA.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Qe8cA.jpg" alt="print bed for Micro +" /></a></p>
<p>I would like to know how to get it off, as I tried freezing, scraping and sandpaper</p>
<hr />
<p>To clarify some things:</p>
<ul>
<li>The material is PLA,</li>
<li>bed is made of plastic.</li>
</ul>
<p>My build plate surface got destroyed after trying to use Cura, which sliced wrong and engraved the print into my bed.</p>

In general I would use
https://github.com/rcarlyle/StepperSim
which takes into account more parameters.
You can play with voltage and current to see which combination gives you the best results for your motor.
Or you can change to a TMC driver with higher voltage (35-50 V) to keep torque at much higher speeds and push the current motor more.
Since the torque you require is likely not so high, you can increase the speed of your stepper motor with 3D printed herringbone gears, for example 4:1. They don't need to be super accurate, backlash is totally fine considering the ridiculous 40:1 reduction.