<p>It seems there are some missing lines on the outer wall on the Z-axis with my prints. I'm not able to pinpoint the problem. Does anyone have ideas about what might be wrong with my setup/settings?</p>
<p>Example:</p>
<p><a href="https://i.stack.imgur.com/3q1k3.jpg" rel="nofollow noreferrer" title="Printed model with printing errors highlighted"><img src="https://i.stack.imgur.com/3q1k3.jpg" alt="Printed model with printing errors highlighted" title="Printed model with printing errors highlighted" /></a></p>
<p>Here are some settings that I think are relevant:<br />
Printer: Ender 3 v1<br />
Filament: Das Filament<br />
Slicer: Cura</p>
<ul>
<li>Hotend temp: 215 °C</li>
<li>Layer height: 0.2 mm</li>
<li>Wall speed: 30 mm/s</li>
<li>Travel speed: 200 mm/s</li>
<li>Retraction distance: 6.5 mm</li>
<li>Combing mode: not in skin (Max comb: 30)</li>
</ul>
<p>Cheers</p>

According to
'The-EG' comment
in this GitHub issue,
Add Creality Ender 2 Pro config #633
, you can often determine the stepper drivers by one of a few ways:
Listen to the sound. The 'TMC22**' will sound much quieter
Look for a marking in Sharpie on the SD Card reader
```
```
C = HR4998
E = A4988
A = TMC2208
B = TMC2209
H = TMC2225
```
```
Remove the heat sync
https://github.com/MarlinFirmware/Configurations/pull/633#issuecomment-995480295
After removing the heat sync, it appears that the Chip is actually a
```
MS35775
```