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diff --git a/Marlin/src/gcode/feature/i2c/M260_M261.cpp b/Marlin/src/gcode/feature/i2c/M260_M261.cpp
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--- /dev/null
+++ b/Marlin/src/gcode/feature/i2c/M260_M261.cpp
@@ -0,0 +1,76 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../../inc/MarlinConfig.h"
+
+#if ENABLED(EXPERIMENTAL_I2CBUS)
+
+#include "../../gcode.h"
+
+#include "../../../feature/twibus.h"
+
+/**
+ * M260: Send data to a I2C slave device
+ *
+ * This is a PoC, the formatting and arguments for the GCODE will
+ * change to be more compatible, the current proposal is:
+ *
+ *  M260 A<slave device address base 10> ; Sets the I2C slave address the data will be sent to
+ *
+ *  M260 B<byte-1 value in base 10>
+ *  M260 B<byte-2 value in base 10>
+ *  M260 B<byte-3 value in base 10>
+ *
+ *  M260 S1 ; Send the buffered data and reset the buffer
+ *  M260 R1 ; Reset the buffer without sending data
+ */
+void GcodeSuite::M260() {
+  // Set the target address
+  if (parser.seen('A')) i2c.address(parser.value_byte());
+
+  // Add a new byte to the buffer
+  if (parser.seen('B')) i2c.addbyte(parser.value_byte());
+
+  // Flush the buffer to the bus
+  if (parser.seen('S')) i2c.send();
+
+  // Reset and rewind the buffer
+  else if (parser.seen('R')) i2c.reset();
+}
+
+/**
+ * M261: Request X bytes from I2C slave device
+ *
+ * Usage: M261 A<slave device address base 10> B<number of bytes>
+ */
+void GcodeSuite::M261() {
+  if (parser.seen('A')) i2c.address(parser.value_byte());
+
+  uint8_t bytes = parser.byteval('B', 1);
+
+  if (i2c.addr && bytes && bytes <= TWIBUS_BUFFER_SIZE)
+    i2c.relay(bytes);
+  else
+    SERIAL_ERROR_MSG("Bad i2c request");
+}
+
+#endif