diff --git a/Firmware/mmu.cpp b/Firmware/mmu.cpp
index 7c38e9ea..3e71737a 100644
--- a/Firmware/mmu.cpp
+++ b/Firmware/mmu.cpp
@@ -113,8 +113,10 @@ void mmu_loop(void)
 	case -1:
 		if (mmu_rx_start() > 0)
 		{
+#ifdef MMU_DEBUG
 			puts_P(PSTR("MMU => 'start'"));
 			puts_P(PSTR("MMU <= 'S1'"));
+#endif //MMU_DEBUG
 		    mmu_puts_P(PSTR("S1\n")); //send 'read version' request
 			mmu_state = -2;
 		}
@@ -128,9 +130,11 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%u"), &mmu_version); //scan version from buffer
+#ifdef MMU_DEBUG
 			printf_P(PSTR("MMU => '%dok'\n"), mmu_version);
 			puts_P(PSTR("MMU <= 'S2'"));
-		    mmu_puts_P(PSTR("S2\n")); //send 'read buildnr' request
+#endif //MMU_DEBUG
+			mmu_puts_P(PSTR("S2\n")); //send 'read buildnr' request
 			mmu_state = -3;
 		}
 		return;
@@ -138,11 +142,15 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%u"), &mmu_buildnr); //scan buildnr from buffer
+#ifdef MMU_DEBUG
 			printf_P(PSTR("MMU => '%dok'\n"), mmu_buildnr);
+#endif //MMU_DEBUG
 			bool version_valid = mmu_check_version();
 			if (!version_valid) mmu_show_warning();
 			else puts_P(PSTR("MMU version valid"));
+#ifdef MMU_DEBUG
 			puts_P(PSTR("MMU <= 'P0'"));
+#endif //MMU_DEBUG
 		    mmu_puts_P(PSTR("P0\n")); //send 'read finda' request
 			mmu_state = -4;
 		}
@@ -151,7 +159,9 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%hhu"), &mmu_finda); //scan finda from buffer
+#ifdef MMU_DEBUG
 			printf_P(PSTR("MMU => '%dok'\n"), mmu_finda);
+#endif //MMU_DEBUG
 			puts_P(PSTR("MMU - ENABLED"));
 			mmu_enabled = true;
 			mmu_state = 1;
@@ -163,39 +173,51 @@ void mmu_loop(void)
 			if ((mmu_cmd >= MMU_CMD_T0) && (mmu_cmd <= MMU_CMD_T4))
 			{
 				filament = mmu_cmd - MMU_CMD_T0;
+#ifdef MMU_DEBUG
 				printf_P(PSTR("MMU <= 'T%d'\n"), filament);
+#endif //MMU_DEBUG
 				mmu_printf_P(PSTR("T%d\n"), filament);
 				mmu_state = 3; // wait for response
 			}
 			else if ((mmu_cmd >= MMU_CMD_L0) && (mmu_cmd <= MMU_CMD_L4))
 			{
 			    filament = mmu_cmd - MMU_CMD_L0;
+#ifdef MMU_DEBUG
 			    printf_P(PSTR("MMU <= 'L%d'\n"), filament);
+#endif //MMU_DEBUG
 			    mmu_printf_P(PSTR("L%d\n"), filament);
 			    mmu_state = 3; // wait for response
 			}
 			else if (mmu_cmd == MMU_CMD_C0)
 			{
+#ifdef MMU_DEBUG
 				printf_P(PSTR("MMU <= 'C0'\n"));
+#endif //MMU_DEBUG
 				mmu_puts_P(PSTR("C0\n")); //send 'continue loading'
 				mmu_state = 3;
 			}
 			else if (mmu_cmd == MMU_CMD_U0)
 			{
+#ifdef MMU_DEBUG
 				printf_P(PSTR("MMU <= 'U0'\n"));
+#endif //MMU_DEBUG
 				mmu_puts_P(PSTR("U0\n")); //send 'unload current filament'
 				mmu_state = 3;
 			}
 			else if ((mmu_cmd >= MMU_CMD_E0) && (mmu_cmd <= MMU_CMD_E4))
 			{
 				int filament = mmu_cmd - MMU_CMD_E0;
+#ifdef MMU_DEBUG				
 				printf_P(PSTR("MMU <= 'E%d'\n"), filament);
+#endif //MMU_DEBUG
 				mmu_printf_P(PSTR("E%d\n"), filament); //send eject filament
 				mmu_state = 3; // wait for response
 			}
 			else if (mmu_cmd == MMU_CMD_R0)
 			{
+#ifdef MMU_DEBUG
 				printf_P(PSTR("MMU <= 'R0'\n"));
+#endif //MMU_DEBUG
 				mmu_puts_P(PSTR("R0\n")); //send recover after eject
 				mmu_state = 3; // wait for response
 			}
@@ -203,7 +225,9 @@ void mmu_loop(void)
 		}
 		else if ((mmu_last_response + 300) < millis()) //request every 300ms
 		{
+#ifdef MMU_DEBUG
 			puts_P(PSTR("MMU <= 'P0'"));
+#endif //MMU_DEBUG
 		    mmu_puts_P(PSTR("P0\n")); //send 'read finda' request
 			mmu_state = 2;
 		}
@@ -212,7 +236,9 @@ void mmu_loop(void)
 		if (mmu_rx_ok() > 0)
 		{
 			fscanf_P(uart2io, PSTR("%hhu"), &mmu_finda); //scan finda from buffer
+#ifdef MMU_DEBUG
 			printf_P(PSTR("MMU => '%dok'\n"), mmu_finda);
+#endif //MMU_DEBUG
 			//printf_P(PSTR("Eact: %d\n"), int(e_active()));
 			if (!mmu_finda && CHECK_FINDA && fsensor_enabled) {
 				fsensor_stop_and_save_print();
@@ -232,7 +258,9 @@ void mmu_loop(void)
 	case 3: //response to mmu commands
 		if (mmu_rx_ok() > 0)
 		{
+#ifdef MMU_DEBUG
 			printf_P(PSTR("MMU => 'ok'\n"));
+#endif //MMU_DEBUG
 			mmu_ready = true;
 			mmu_state = 1;
 		}
diff --git a/Firmware/ultralcd.cpp b/Firmware/ultralcd.cpp
index 1ba60dee..26736c95 100644
--- a/Firmware/ultralcd.cpp
+++ b/Firmware/ultralcd.cpp
@@ -530,7 +530,7 @@ void lcdui_print_extruder(void)
 {
 	int chars = 0;
 	if (mmu_extruder == tmp_extruder)
-		chars = lcd_printf_P(_N(" T%u"), mmu_extruder+1);
+		chars = lcd_printf_P(_N(" F%u"), mmu_extruder+1);
 	else
 		chars = lcd_printf_P(_N(" %u>%u"), mmu_extruder+1, tmp_extruder+1);
 	lcd_space(5 - chars);
@@ -5014,18 +5014,18 @@ char choose_extruder_menu()
 	
 	enc_dif = lcd_encoder_diff;
 	lcd_clear();
-	
-	lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
+	if (mmu_enabled) lcd_puts_P(_T(MSG_CHOOSE_FILAMENT));
+	else lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
 	lcd_set_cursor(0, 1);
 	lcd_print(">");
 	for (int i = 0; i < 3; i++) {
-		lcd_puts_at_P(1, i + 1, _T(MSG_EXTRUDER));
+		lcd_puts_at_P(1, i + 1, mmu_enabled ? _T(MSG_FILAMENT) : _T(MSG_EXTRUDER));
 	}
 	KEEPALIVE_STATE(PAUSED_FOR_USER);
 	while (1) {
 
 		for (int i = 0; i < 3; i++) {
-			lcd_set_cursor(2 + strlen_P(_T(MSG_EXTRUDER)), i+1);
+			lcd_set_cursor(2 + strlen_P( mmu_enabled ? _T(MSG_FILAMENT) : _T(MSG_EXTRUDER)), i+1);
 			lcd_print(first + i + 1);
 		}
 
@@ -5048,9 +5048,10 @@ char choose_extruder_menu()
 					if (first < items_no - 3) {
 						first++;
 						lcd_clear();
-						lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
+						if (mmu_enabled) lcd_puts_P(_T(MSG_CHOOSE_FILAMENT));
+						else lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
 						for (int i = 0; i < 3; i++) {
-							lcd_puts_at_P(1, i + 1, _T(MSG_EXTRUDER));
+							lcd_puts_at_P(1, i + 1,  mmu_enabled ? _T(MSG_FILAMENT) : _T(MSG_EXTRUDER));
 						}
 					}
 				}
@@ -5060,9 +5061,10 @@ char choose_extruder_menu()
 					if (first > 0) {
 						first--;
 						lcd_clear();
-						lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
+						if (mmu_enabled) lcd_puts_P(_T(MSG_CHOOSE_FILAMENT));
+						else lcd_puts_P(_T(MSG_CHOOSE_EXTRUDER));
 						for (int i = 0; i < 3; i++) {
-							lcd_puts_at_P(1, i + 1, _T(MSG_EXTRUDER));
+							lcd_puts_at_P(1, i + 1, mmu_enabled ? _T(MSG_FILAMENT) : _T(MSG_EXTRUDER));
 						}
 					}
 				}
diff --git a/Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h
index 304cde4b..626c64e8 100644
--- a/Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK25-RAMBo10a-E3Dv6full.h
@@ -481,4 +481,6 @@
 
 //#define SUPPORT_VERBOSITY
 
+//#define MMU_DEBUG //print communication between MMU2 and printer on serial
+
 #endif //__CONFIGURATION_PRUSA_H
diff --git a/Firmware/variants/1_75mm_MK25-RAMBo13a-E3Dv6full.h b/Firmware/variants/1_75mm_MK25-RAMBo13a-E3Dv6full.h
index 9fccbfc2..cb13e8ad 100644
--- a/Firmware/variants/1_75mm_MK25-RAMBo13a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK25-RAMBo13a-E3Dv6full.h
@@ -482,4 +482,6 @@
 
 //#define SUPPORT_VERBOSITY
 
+//#define MMU_DEBUG //print communication between MMU2 and printer on serial
+
 #endif //__CONFIGURATION_PRUSA_H
diff --git a/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
index 7cde630b..ea1951f4 100644
--- a/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK3-EINSy10a-E3Dv6full.h
@@ -613,4 +613,6 @@
 
 //#define SUPPORT_VERBOSITY
 
+//#define MMU_DEBUG //print communication between MMU2 and printer on serial
+
 #endif //__CONFIGURATION_PRUSA_H