Hi Ayouden, i think the limitation is more from the stepstick, than from the motor (apart from heating).
I've done a quick try on the counterweights, i'm not sure it changed much, maybe i should retry more thouroughly.
then tried the DRV8825's on 32x microstepping, these guys put a lot more torque than the A4988's (it's lifting and moving 800 grams without any issue at slow speed),
but they do heat quite quickly (after 10min of operation, sticks at 74°C for a vref of 0.4; and steppers at 40°C) and i wonder if it's sustainable on a say 8hrs print
also, the arduino is lacking the crunching power to handle the 32x microsteps, it happens sometimes (probably buffer issues ?) when speeds is set beyond 60mm/s, and other times, the build is handling 600mm/s (shaky though)
so i'll go with the DRV8825's as my primary intent was to move slowly. i've got some doubts though, as some say they handle the waveform less smoothly than the A4988's, and are notorious to skip steps at high torque.
also, i'm getting other issues, when doing homing after playing with M220 Sxxx - but that's probably related to either bugs in repetier, or in the variant of marlin
i'll put more infos on my choices / what i found best
I've done a quick try on the counterweights, i'm not sure it changed much, maybe i should retry more thouroughly.
then tried the DRV8825's on 32x microstepping, these guys put a lot more torque than the A4988's (it's lifting and moving 800 grams without any issue at slow speed),
but they do heat quite quickly (after 10min of operation, sticks at 74°C for a vref of 0.4; and steppers at 40°C) and i wonder if it's sustainable on a say 8hrs print
also, the arduino is lacking the crunching power to handle the 32x microsteps, it happens sometimes (probably buffer issues ?) when speeds is set beyond 60mm/s, and other times, the build is handling 600mm/s (shaky though)
so i'll go with the DRV8825's as my primary intent was to move slowly. i've got some doubts though, as some say they handle the waveform less smoothly than the A4988's, and are notorious to skip steps at high torque.
also, i'm getting other issues, when doing homing after playing with M220 Sxxx - but that's probably related to either bugs in repetier, or in the variant of marlin
i'll put more infos on my choices / what i found best