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Sorry, I am mistaken. It’s difficult to see what your issue could be, I use similar “generic” drivers and about 1.7 amp steppers and can stop the motors with my fingers no worries. I would finish your printer build and see how it goes
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On your Ramps board, there is a stepper driver for each motor, perhaps the settings need tweaking which will increase the torque. Try this tutorial below to tune your motors, you’ll need a tiny flathead screwdriver and careful fingers. Tune each motor, then let us know the results. It explains just …
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I have had something similar on one of my printers (Prusa i3): Possibly that the filament is more or less brittle and is being eaten up in your extruder and then ‘under extruding’ for some parts, may be happening more as it gets faster on long stretches… Increasing the temperature may temporarily se…
