Ender 3 S1 (PRO) filament guide

Not the best, but simple solution.

Just print whatever you want. Put on the spool and filament sensor. And that's all. Can be used. Of course, if you have a 4mm PTFE tube. 

I use a tube id = 3mm od = 4mm. (Works great. Pulls out without any effort.) Haven't tried to use with tubes of a smaller inner diameter, I think there may be problems due to too long path.

Use mirroring for other side.