Just thought I would quickly share what can happen if you’re not paying attention with a heavy mass spool if you’re not careful. I have all my spools on a dowel rod attached to the top of my printer enclosure and fed through an opening in the top. Never had the slightest issue with 1 kg spools, and I thought I would save a little bit of money and time changing filament by trying a 3 kg spool. It spins perfectly fine without friction, but the much heavier mass is enough to cause it to have significant strain on the extruder pulling it in to the hot end. You can see in the result where I provided strain relief by hand while watching it print. 
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Can you tune it out by bumping your extrusion multiplier? I’ve run 3 kg spools more or less exclusively for like 5 years now. They ride on ball bearings though. I do print the occasional 1 kg spool and don’t have issues swapping back and forth.
You’d probably have to keep tuning as the weight of the spool decreases.
Its more practical to print a spool holder with bearings for it. Thingyverse has some good onesIt’s* more practical
You mentioned already having smaller spools, can just transfer some of it there. Best of both worlds, if a little tedious
That’s probably what I’ll end up doing
One day filament will come with DRM so you can’t print it backwards. Only a pirate would do that!
You might try greasing the dowel.
So… KY? Astroglide?
PTFE super lube. Won’t degrade and stink up the place. It’s the same lube you put on linear bearings.
Ig you think that’s bad wait until you get multiple retractions going that the rocking motion of the 3kg Is probably going to be enough to pull the filament right out of the extruder.
I have my 3kg spools above the printer as well, not having your issue, I think the difference is I’m using a guide pulley on a skate bearing to direct the filament straight into the extruder.
