LK4 Direct Drive Modification

To print flexible filament, the only way is to mod LK4 to direct drive mode. Luckily the added weight doesn't affect print results. After the mod, change your retraction value to 1.2mm. It works with Flex98A filament now, but 95A still too soft for this hack. Happy printing!

This is remix of https://www.thingiverse.com/thing:4376113