<p>Flashed Marlin 2.0 on my Folgertech 2020 Prusa i3 variant.</p>

<p>Calibrating seems to have gone smoothly until I tried to set up UBL.</p>

<p>Saved the mesh into EEPROM with the <code>M500</code> command after a <code>G29 P1</code>.</p>

<p>When trying to do a test print with <code>G26 P10</code>, the temperatures for bed and hotend seem to jump (see <a href="https://i.sstatic.net/yh3u6.jpg" rel="noreferrer">this video</a>).</p>

<p><em>Not sure if this helps but I was following <a href="https://www.youtube.com/watch?v=ONpKxkil16Q" rel="noreferrer">this tutorial</a>.</em></p>

<p>Not sure what's going on here or how I can fix this. When I power cycle everything, this issue persists.</p>

<p>I noticed my Z probe arm's servo was buzzing. I unplugged it and the numbers stabilized. Not sure what's going on but seems like I need to stop  the power going to the servo when it's back to the 0 degree position.</p>

CC BY-SA 4.0
2019-11-19T07:04:28.507Z
Hi PGT, welcome to 3DPrinting.SE! Your last edit sounds like an answer, but maybe not the preferred solution... Please add a photo, from the edit we got some idea of the ABL leveling system you are using.
0scar
CC BY-SA 4.0
2019-11-19T16:24:05.623Z
Hi @0scar, thanks for the response. Definitely not ideal since I want the servo to be locked in place when doing the Z-axis homing, my current solution (I will test when I get home) is to turn off the power of the servo when it gets to a specific angle. If it's not locked in place, then it might move when doing the bed levelling. Can I ask what should be in the photo?
PGT
CC BY-SA 4.0
2019-11-20T05:49:27.113Z
I meant a photo of the Z-probe on the hotend carriage.
0scar
<marlin><prusa-i3><troubleshooting><calibration><bed-leveling>
Marlin 2.0 Firmware temperature jumping on LCD when trying to configure UBL
PGT
# Marlin 2.0 Firmware temperature jumping on LCD when trying to configure UBL

(Asked by: username_0 on 2019-11-19)

Flashed Marlin 2.0 on my Folgertech 2020 Prusa i3 variant.

Calibrating seems to have gone smoothly until I tried to set up UBL.

Saved the mesh into EEPROM with the `M500` command after a `G29 P1`.

When trying to do a test print with `G26 P10`, the temperatures for bed and hotend seem to jump (see [this video](https://i.sstatic.net/yh3u6.jpg)).

*Not sure if this helps but I was following [this tutorial](https://www.youtube.com/watch?v=ONpKxkil16Q).*

Not sure what's going on here or how I can fix this. When I power cycle everything, this issue persists.

I noticed my Z probe arm's servo was buzzing. I unplugged it and the numbers stabilized. Not sure what's going on but seems like I need to stop the power going to the servo when it's back to the 0 degree position.

**Tags:** marlin, prusa-i3, troubleshooting, calibration, bed-leveling
> **Comments:**
> **username_1**: Hi PGT, welcome to 3DPrinting.SE! Your last edit sounds like an answer, but maybe not the preferred solution... Please add a photo, from the edit we got some idea of the ABL leveling system you are using.  
> **username_0**: Hi @0scar, thanks for the response. Definitely not ideal since I want the servo to be locked in place when doing the Z-axis homing, my current solution (I will test when I get home) is to turn off the power of the servo when it gets to a specific angle. If it's not locked in place, then it might move when doing the bed levelling. Can I ask what should be in the photo?  
> **username_1**: I meant a photo of the Z-probe on the hotend carriage.  

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## 0 answers

