<p>I printed out this calibration shape from <a href="https://www.thingiverse.com/thing:2656594" rel="nofollow noreferrer">Thingiverse</a> with an unexpectedly catastrophic failure.  It looks like there are <em>a lot</em> of things wrong here.</p>

<p><img src="https://i.stack.imgur.com/V7QlZ.jpg" alt="Front View">
<img src="https://i.imgur.com/assIZiQ.png" alt="Side View"></p>

<p>I used the <code>Normal</code> profile in Ultimaker Cura.</p>

<p>There's so much bad in this print that I'm not sure where to start.</p>

<ol>
<li>It appears that walls weren't printed at all.  </li>
<li>Resolution is way below par.  </li>
<li>Overhangs are collapsing (not sure if that would be expected at those angles)</li>
<li>The in-filling is inconsistent and "blobby".</li>
</ol>

The oozing is due to hot-end getting hot before the bed leveling procedure: if you move the hot-end warm up command
after
the
```
G29
```
line you avoid that oozing
```
```
; Ender 3 Custom Start G-code
M104 S{material_print_temperature_layer_0} ; Set Extruder temperature
M140 S{material_bed_temperature_layer_0} ; Set Heat Bed temperature
G28 ; Home all axes
G29 ; BLTOUCH Mesh Generation
M190 S{material_bed_temperature_layer_0} ; Wait for Heat Bed temperature
M109 S{material_print_temperature_layer_0} ; Wait for Extruder temperature
G1 F1800 E-3 ; Retract filament 3 mm to prevent oozing
G92 E0 ; Reset Extruder
G1 Z5.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y20 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y20 Z0.3 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
G1 Z5.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
```
```
The above code will activate the heating elements but starts homing and leveling procedure without waiting for the elements to get up to temperature. Only after the bed leveling is finished the printer will pause and wait for the heating elements reach the desired temperature.
This will prevent oozing on a cold start, but you will still be affected if you start a print right after another print, when the hot-end is still close to  melting temperature.
If you prefer to avoid that condition you might want to also move the
```
M104
```
and
```
M140
```
commands after the
```
G29
```
bed leveling command.