From 0aed59c947360b2ddba73a3e02a036eb70308b58 Mon Sep 17 00:00:00 2001
From: Marek Bel <marek.bel@posta.cz>
Date: Tue, 30 Jul 2019 19:06:57 +0200
Subject: [PATCH] Fix unsigned char overflow cause invalid filament load.

---
 Firmware/mmu.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Firmware/mmu.cpp b/Firmware/mmu.cpp
index 21ce96d70..d6e533dfb 100755
--- a/Firmware/mmu.cpp
+++ b/Firmware/mmu.cpp
@@ -978,7 +978,7 @@ void extr_adj(uint8_t extruder) //loading filament for SNMM
 {
 #ifndef SNMM
     MmuCmd cmd = MmuCmd::L0 + extruder;
-    if (cmd > MmuCmd::L4)
+    if (extruder > (MmuCmd::L4 - MmuCmd::L0))
     {
         printf_P(PSTR("Filament out of range %d \n"),extruder);
         return;