We’ve had a few reports of problems loading filament on the XL. I did find some problems and fixed them today, and I did some load/unload cycles of all of the extruders to be sure that everything was working properly.
If you run into these problems yourself, you can probably fix them! I’ve written up some tips in the wiki: Prusa XL - Asmbly Wiki
As always, please feel free to make the wiki page better if you have ideas.
Pro tip: If you are loading or unloading multiple extruders at once, it is much faster to use the Change Filament In All Tools command than Load and Unload one at a time because you don’t have to wait as long for each one to heat up.