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Looking for the Monoprice MP Mini Delta Wiki?





Standard Marlin compatible G-codes can be found at the RepRap wiki: G-code.
Not all standard G-code are supported by the MP Select Mini.

See the G-code page for information about software to use and how to send G-code.

Extended G-code

See the Extended G-code Table for G-code that is more or less specific to the MP Select Mini & Malyan printers.

Command Format


Start byte: "{"

Command string: CMD. Please reference to available command list. 

Divide byte: ":"

Value string: PARAM

End byte: "}"

Available Commands

CMD PARAM function
P X Cancel print
H Homing
P Pause print
R Resume print
M Print cache.gc
C T0000 Set T0 temperature
P000 Set hotbed temperature
e e Return printing status
M Return mac address
J X Moves the X-Axis
Y Moves the Y-Axis
Z Moves the Z-Axis
S I List files on the microSD card
V Displays firmware versions on LCD
W Deletes WiFi SSID and password

Sample Code for Web UI

Sample Web UI

Moved to it's own page. Sample Web UI

Send GCODE M565 to start print file cache.gc

function start_p(){
		url: "set?code=M565",
		cache: false
	}).done(function(html) {

Get printing status

	var c=data.charAt(data.length-1);
	if (c=='I')
		$("#stat").text("Status: Idle");
	else if (c=='P')
		$("#stat").text("Status: Printing");
	else $("#stat").text("Status: ");

Send Control command {P:X} to cancel print

function cancel_p(){
		url: "set?cmd={P:X}",
		cache: false
	}).done(function(html) {

Set extruder temperature

function pad(num, size) {
    var s = "000" + num;
    return s.substr(s.length-size);

var value=pad($("#wre").val(),3);
	url: 'set?cmd={C:T0'+value+'}',
	cache: false
}).done(function(html) {

Stop preheat heat bed

		url: "set?cmd={C:P000}",
		cache: false
	}).done(function(html) {

Set printing speed

1X Speed: {C:S10}
1.5X Speed: {C:S15}
5X Max

Send gcode though WebSocket interface

var ws = new WebSocket('ws://');
ws.onopen = function () {


Using AJAX and REST a single line of code g-code can be sent without a socket connection.

Send extended command though REST:{P:X}

Web Browser Address Bar

While the MP Select Mini V1/V2 is connected to WiFi you may use the format http://PRINTERS_IP_ADDRESS/set?code=G-CODE_COMMAND to send a single line of code g-code using a web browsers address/URL bar. See the examples in the following code block.

Format: http://PRINTERS_IP_ADDRESS/set?code=G-CODE_COMMAND X53 S6 X Y

When a command is sent and received successfully the browser should display `Ok`, `OK`, or `ok`. Additional g-code commands can be sent one after another using the same format.

Network interface

UDP Interface

MM32 will response UDP broadcast or unicast on port 6000.

Command: “{e:e}” will reply with current status; “{e:M}” will echo MAC address.

Below is sample C# code for discovery MM32 in local network.

            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();

            for (int i = 0; i < interfaces.Length; i++)
                if (interfaces[i].OperationalStatus != OperationalStatus.Up) continue;
                IPInterfaceProperties property = interfaces[i].GetIPProperties();
                foreach (UnicastIPAddressInformation ip in property.UnicastAddresses)
                    //textBox1.Text += ip.Address + Environment.NewLine;

                    if (ip.Address.AddressFamily == AddressFamily.InterNetworkV6) continue;
                    if (ip.Address.GetAddressBytes()[0] == 255 || ip.Address.GetAddressBytes()[0] == 0) continue;

                    UdpClient client = new UdpClient(new IPEndPoint(ip.Address, 0));
                    IPEndPoint iep = new IPEndPoint(IPAddress.Broadcast, 6000);
                    byte[] buffer = Encoding.UTF8.GetBytes("{e:e}");
                    client.Send(buffer, buffer.Length, iep);
                    while (client.Available != 0)
                        byte[] data = client.Receive(ref iep);
                        //textBox1.Text += Encoding.UTF8.GetString(data) + Environment.NewLine;

                        //if (Encoding.UTF8.GetString(data).Contains("}")) textBox1.Text += iep.Address;
                        string str = Encoding.UTF8.GetString(data);

                            var regex = new Regex(@"\d+");
                            MatchCollection mc = regex.Matches(str);

                            if (mc.Count == 4)
                                notifyIcon1.Text = "Extruder:" + mc[0].Value + "°C Target:" + mc[1].Value + "°C\nPlatform:" + mc[2].Value + "°C Target:" + mc[3].Value + "°C";
                        toolStripComboBox1.SelectedIndex = 0;

                        localIP = ip.Address;


TCP Interface

The printer also supports TCP interface instead of COM port to send G-code. Create a TCP socket on port 23 and send G-code as a string to receive a response.

  • Send empty line included LF/CR character to flush garbage in buffer.
  • Handle RST(reset) signal properly by closing the current connection and open a new socket to recover from disconnect.

The printer by default will accept two TCP connections. If a single connection sends a command, both connected sockets will receive same response message.

Use a program like PuTTY or another Telnet client to connect to the MP Select Mini.

Upload Custom Web UI

NOTE: You'll need to be using at least UI Controller firmware version 42 to enable this feature.

  1. Enter http://PRINTERS_IP_ADDRESS/up into a web browsers address bar
  2. Upload html file using the 3rd “Choose File” button
  3. Click the “Upload web” button
  4. Enter http://PRINTERS_IP_ADDRESS
  5. Custom Web UI should appear

Default Web UI

  1. Enter http://PRINTERS_IP_ADDRESS/up into a web browsers address bar
  2. Click the “Upload web” button (don't bother with the “Choose File” button
  3. Enter http://PRINTERS_IP_ADDRESS
  4. Default Web UI will appear

Sample Web UI

Moved to it's own page. Sample Web UI


The printer provides a WebSocket server for integrating control panel using a Web UI. Below is sample Javascript code to send G28 command though the WebSocket:

var ws = new WebSocket('ws://');
ws.onopen = function () {

Using JavaScript along with the WebSocket, you can create a custom Web UI.

WebSocket Test Page

Moved to it's own page. WebSocket Test Page

communications.txt · Last modified: 2017/11/25 03:53 by Matthew Upp