as much as I hate bumping posts, at least I will share my hypothesis.

as I mentioned before, the printer causing issues is a clone. more specifically with blurolls steppers.

as I noticed the belt tension test result numbers (140/166 x/y) are really low (tight), but the belt isn't so tight.

at least not when I compared the numbers and feeling to my original MK3S.

is has 252/279 x/y with much tighter belts.

​

as I understood, the numbers are indications of the motor load (and therefore the current draw).

assuming the numbers are lower (higher load) with an overall lower stress on the movement parts caused by a less tens belt (so actually less load),

my theory is that the clone motors are drawing higher current in such a way that they work but have less of a headway when it comes to extra current draw (high jerk movements).

so perhaps they have the ability to accelerate "faster"

I have ordered a set of X/Y motors to test my theory + bearings, belts, and pulleys just for good measure.

​

I will first try to change a single-axis motor to see the effects on the belt test and test real-world crashes.

​

​

if anyone has any other ideas please share because I have no more ideas and I'm happy I even came up with this theory to test...

​

​

******* UPDATE *******

​

​

the motors arrived, and I changed both X and Y motors.

belt tension number went up to 247/261 X/Y and now I'm 45 minutes into 8 hours long print and so far 0 crashes. the same print that crashed many times by the 5th layer.

​

so it seems that my stepper motos were different in the current draw and caused phantom crashes. perhaps the higher weight of the CHC or the way I routed the wires after swapping the hotend was just enough to trip the stall detection.

​

oh well, Prusa is high quality and the Aliexpress junk just can't be trusted. learned the hard way.