Have the mk2 4 color system on my ender 3 v2 with microswiss hotend. The mk2 unit has issues loading and unloading filament. I have to assist the filament to get it to move. The filament moves freely through the ptfe tubing by hand. I have never had any luck with this kit yet and could use some help otherwise it’s going to come off and sit in a box and collect dust.