Set slowest printing speed

print_image.sh

@@ -15,6 +15,10 @@ size="$(hex_size "$(("$size" + 10))")"
 size_x="$(hex_size "$(echo "$data_header" | cut -d' ' -f 1)")"
 size_y="$(hex_size "$(echo "$data_header" | cut -d' ' -f 2)")"
 
+# Set print speed
+printf '\x1D(K\2\0' > $dev
+printf '51' > $dev
+
 # Upload graphics data
 printf '\x1D(L' > $dev
 printf "$size" > $dev
@@ -26,7 +30,8 @@ printf "$size_y" > $dev  # size y
 echo "$data" | base64 -d > $dev
 
 # Print graphics data
-printf '\x1D(L\2\00002' > $dev
+printf '\x1D(L\2\0' > $dev
+printf '02' > $dev
 
 # Cut paper
 printf '\n\n\n\x1DVA\0' > $dev