diff --git a/resources/quality/Hellbot_pla_Grey.xml.fdm_material b/resources/quality/Hellbot_pla_Grey.xml.fdm_material
deleted file mode 100644
index f37a745544..0000000000
--- a/resources/quality/Hellbot_pla_Grey.xml.fdm_material
+++ /dev/null
@@ -1,28 +0,0 @@
-<?xml version='1.0' encoding='utf-8'?>
-<fdmmaterial version="1.3" xmlns="http://www.ultimaker.com/material">
-    <metadata>
-        <name>
-            <brand>Hellbot</brand>
-            <material>PLA</material>
-            <color>Gris</color>
-        </name>
-        <color_code>#4b4b4b</color_code>
-        <GUID>0ff92885-617b-4144-a03c-9989872454bc</GUID>
-        <adhesion_info />
-        <version>1</version>
-        <description />
-    </metadata>
-    <properties>
-        <diameter>1.75</diameter>
-        <density>1.24</density>
-        <weight>1000</weight>
-    </properties>
-    <settings>
-        <setting key="standby temperature">200</setting>
-        <setting key="print cooling">100.0</setting>
-        <setting key="retraction amount">6.2</setting>
-        <setting key="print temperature">200</setting>
-        <setting key="heated bed temperature">60.0</setting>
-        <setting key="retraction speed">40.0</setting>
-    </settings>
-</fdmmaterial>