Fill in manufacturers previously set to unknown/'not applicable'.

resources/definitions/bibo2_dual.def.json

@@ -5,7 +5,7 @@
     "inherits": "fdmprinter",
     "metadata": {
         "visible": true,
-        "author": "na",
+        "author": "unknown",
         "manufacturer": "BIBO",
         "category": "Other",
         "file_formats": "text/x-gcode",

resources/definitions/makeit_pro_l.def.json

@@ -4,8 +4,8 @@
     "inherits": "fdmprinter",
     "metadata": {
         "visible": true,
-        "author": "NA",
-        "manufacturer": "NA",
+        "author": "unknown",
+        "manufacturer": "MAKEiT 3D",
         "file_formats": "text/x-gcode",
         "has_materials": false,
         "machine_extruder_trains":

resources/definitions/makeit_pro_m.def.json

@@ -4,8 +4,8 @@
     "inherits": "fdmprinter",
     "metadata": {
         "visible": true,
-        "author": "NA",
-        "manufacturer": "NA",
+        "author": "unknown",
+        "manufacturer": "MAKEiT 3D",
         "file_formats": "text/x-gcode",
         "has_materials": false,
         "machine_extruder_trains":

resources/definitions/zone3d_printer.def.json

@@ -5,7 +5,7 @@
     "metadata": {
         "visible": true,
         "author": "Ultimaker",
-        "manufacturer": "Unknown",
+        "manufacturer": "Zone3D",
         "file_formats": "text/x-gcode",
         "platform_offset": [ 0, 0, 0],
         "machine_extruder_trains":