I want to feed the filament to the X1 using the sunlu dryer and was reading about some issues people experienced (like dryer being pulled toward the printer when a roll ends) and then I searched around to find the best add ons to resolve the issue.
This one is a spool holder that attaches to the same place where the rollers currently attach. He has a video that shows how well it works.
https://www.printables.com/model/247479/files
This is an improved spool shaft for the holder above for larger spools, but it still won’t fit very large spools
https://www.printables.com/model/321078-sunlu-dryer-s2-mod-2
The spool shaft needs two 608 bearings
This is an adapter for a PTFE tube