I've added holes to add 4mm PTFE tubing for the spool to rest on. This ensures the spool rolls off better, quieter, without that weird white dust that likes to accumulate.
Cut the PTFE to length and just push it into the channel. It should click right in.
Print it out, push it in, and mount!
PS: Don't forget to pause for the embedded nut!
The author remixed this model.
I've added holes to add 4mm PTFE tubing for the spool to rest on.