I don’t have a good solution for spools. I have a shelf above the printer, and I use two roller base type pieces at the moment. That works really well for full spools, because the filament can’t “unwind” when it’s sitting on the base.
But when I have a nearly empty spool, the filament is strong and springy enough to pull the (now very light) spool off of the rollers, which causes havock.
Do you guys have a spool holder that you like? Do you have one that you like that attaches to the top frame?