Pulley screws too tight prevents proper operation
I tightened the Y-axis pulley screws, and my printer then failed to operate. For example, the belt test resulted in Y-axis failure. (Not an out-of-range number, but flat out failure.)
(Note that the picture isn't the Y-axis motor -- I just wanted to show what I meant by pulley screws.)
Then I loosened the screws a little, leaving them snug but not apparently too tight, and the printer started to work again.
Why are too-tight screws a problem?
That's the first time I hear that to be the case. Did you re-tighten screws with belt on, or did you readjust belt tension too?
[Mini+] [MK3S+BEAR]
Yeah, that's not it
Print yourself a belt tension gauge. You got something much bigger going on. Unless you got the wrong pulley/shaft diameter a semi tight and very tight pulley are indistinguishable to the printer.
UPDATE
Belt on.
My theory is that when I tightened the set screws, I moved the pulley up against the motor, thereby interfering with free turning of the shaft. I loosened the screws, moved the pulley a bit away from the motor, and re-tightened. I think it's OK now.
Thank you for clarifiying
[Mini+] [MK3S+BEAR]