diff --git a/cura/CuraApplication.py b/cura/CuraApplication.py
index 3a67b9b95c..bd54209e36 100644
--- a/cura/CuraApplication.py
+++ b/cura/CuraApplication.py
@@ -554,6 +554,7 @@ class CuraApplication(QtApplication):
         qmlRegisterType(cura.Settings.UserProfilesModel, "Cura", 1, 0, "UserProfilesModel")
         qmlRegisterType(cura.Settings.MaterialSettingsVisibilityHandler, "Cura", 1, 0, "MaterialSettingsVisibilityHandler")
         qmlRegisterType(cura.Settings.QualitySettingsModel, "Cura", 1, 0, "QualitySettingsModel")
+        qmlRegisterType(cura.Settings.MachineNameValidator, "Cura", 1, 0, "MachineNameValidator")
 
         qmlRegisterSingletonType(cura.Settings.ContainerManager, "Cura", 1, 0, "ContainerManager", cura.Settings.ContainerManager.createContainerManager)
 
diff --git a/cura/Settings/MachineNameValidator.py b/cura/Settings/MachineNameValidator.py
new file mode 100644
index 0000000000..d859e85343
--- /dev/null
+++ b/cura/Settings/MachineNameValidator.py
@@ -0,0 +1,69 @@
+# Copyright (c) 2016 Ultimaker B.V.
+# Cura is released under the terms of the AGPLv3 or higher.
+
+from PyQt5.QtCore import pyqtSlot, pyqtProperty, QObject, pyqtSignal, QRegExp
+from PyQt5.QtGui import QValidator
+import os #For statvfs.
+import urllib #To escape machine names for how they're saved to file.
+
+import UM.Resources
+import UM.Settings.ContainerRegistry
+import UM.Settings.InstanceContainer
+
+##  Are machine names valid?
+#
+#   Performs checks based on the length of the name.
+class MachineNameValidator(QObject):
+    def __init__(self, parent = None):
+        super().__init__(parent)
+
+        #Compute the validation regex for printer names. This is limited by the maximum file name length.
+        try:
+            filename_max_length = os.statvfs(UM.Resources.getDataStoragePath()).f_namemax
+        except AttributeError: #Doesn't support statvfs. Probably because it's not a Unix system.
+            filename_max_length = 255 #Assume it's Windows on NTFS.
+        machine_name_max_length = filename_max_length - len("_current_settings.") - len(UM.Settings.ContainerRegistry.getMimeTypeForContainer(UM.Settings.InstanceContainer).preferredSuffix)
+        # Characters that urllib.parse.quote_plus escapes count for 12! So now
+        # we must devise a regex that allows only 12 normal characters or 1
+        # special character, and that up to [machine_name_max_length / 12] times.
+        maximum_special_characters = int(machine_name_max_length / 12)
+        unescaped = r"[a-zA-Z0-9_\-\.\/]"
+        self.machine_name_regex = r"((" + unescaped + "){0,12}|.){0," + str(maximum_special_characters) + r"}"
+
+    validationChanged = pyqtSignal()
+
+    ##  Check if a specified machine name is allowed.
+    #
+    #   \param name The machine name to check.
+    #   \param position The current position of the cursor in the text box.
+    #   \return ``QValidator.Invalid`` if it's disallowed, or
+    #   ``QValidator.Acceptable`` if it's allowed.
+    def validate(self, name, position):
+        #Check for file name length of the current settings container (which is the longest file we're saving with the name).
+        try:
+            filename_max_length = os.statvfs(UM.Resources.getDataStoragePath()).f_namemax
+        except AttributeError: #Doesn't support statvfs. Probably because it's not a Unix system.
+            filename_max_length = 255 #Assume it's Windows on NTFS.
+        escaped_name = urllib.parse.quote_plus(name)
+        current_settings_filename = escaped_name + "_current_settings." + UM.Settings.ContainerRegistry.getMimeTypeForContainer(UM.Settings.InstanceContainer).preferredSuffix
+        if len(current_settings_filename) > filename_max_length:
+            return QValidator.Invalid
+
+        return QValidator.Acceptable #All checks succeeded.
+
+    ##  Updates the validation state of a machine name text field.
+    @pyqtSlot(str)
+    def updateValidation(self, new_name):
+        is_valid = self.validate(new_name, 0)
+        if is_valid == QValidator.Acceptable:
+            print("VALID")
+            self.validation_regex = "^.*$" #Matches anything.
+        else:
+            print("BROKEN!")
+            self.validation_regex = "a^" #Never matches (unless you manage to get "a" before the start of the string... good luck).
+        self.validationChanged.emit()
+
+    @pyqtProperty("QRegExp", notify=validationChanged)
+    def machineNameRegex(self):
+        print(self.machine_name_regex)
+        return QRegExp(self.machine_name_regex)
\ No newline at end of file
diff --git a/cura/Settings/__init__.py b/cura/Settings/__init__.py
index a28073fa7f..0298ac886d 100644
--- a/cura/Settings/__init__.py
+++ b/cura/Settings/__init__.py
@@ -8,6 +8,7 @@ from .CuraContainerRegistry import CuraContainerRegistry
 from .ExtruderManager import ExtruderManager
 from .ExtrudersModel import ExtrudersModel
 from .MachineManager import MachineManager
+from .MachineNameValidator import MachineNameValidator
 from .MaterialSettingsVisibilityHandler import MaterialSettingsVisibilityHandler
 from .SettingOverrideDecorator import SettingOverrideDecorator
 from .QualitySettingsModel import QualitySettingsModel
diff --git a/resources/qml/AddMachineDialog.qml b/resources/qml/AddMachineDialog.qml
index e37629306b..80ac1213a8 100644
--- a/resources/qml/AddMachineDialog.qml
+++ b/resources/qml/AddMachineDialog.qml
@@ -175,6 +175,14 @@ UM.Dialog
         text: getMachineName()
         implicitWidth: UM.Theme.getSize("standard_list_input").width
         maximumLength: 40
+        //validator: Cura.MachineNameValidator { } //TODO: Gives a segfault in PyQt5.6. For now, we must use a signal on text changed.
+        validator: RegExpValidator
+        {
+            regExp: {
+                machineName.machine_name_validator.machineNameRegex
+            }
+        }
+        property var machine_name_validator: Cura.MachineNameValidator { }
         anchors.bottom:parent.bottom
     }