SUNLU S4 block off plug spool indicator

If you are running side feeds on your Sunlu S4 these are designed to snap in and block of the top ports that have rubber inserts. These also indicate what Spool # each slot is. So, insert them according to how you have your spools plumbed. To get a perfect print, you will need to run a .25 nozzle. They will print and work using a .4 nozzle but first layer detail will be degraded slightly.