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clyevo
So from reading this thread conclusion is microstepping does not increase resolution...
Correct, once you go higher than about 16x. OTOH changing from 1.8deg to 0.9deg motors does increase resolution, which is helpful in delta printers and in ungeared extruders.
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clyevo
and reduce torque compare to lower microstepping.
The torque per unit angular error - which is what matters - does not reduce. The incremental torque per microstep reduces, which is hardly surprising because each microstep is smaller.
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clyevo
So there is no point of higher microstepping driver beside reducing noise.
Maybe one slight advantage, it move smoothly causing less ripple and better curve movement.
Correct. You won't necessarily notice the smoother movement, in fact switching to a good 32-bit firmware such as RepRapFirmware will probably give you a greater improvement in smoothness.
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clyevo
Are these conclusions correct? If it is i will stick with a4988 which has higher compatibility with 8bit processor like my atmega 2560.
Wait, can someone please tell me why i should buy the higher microstepping driver? Is it much improvement?
High microstepping makes the printer much quieter when it is moving. If you don't care about the noise, you don't need high microstepping. If you do care about noise, do it properly and get a Duet WiFi or Duet Ethernet, which has TMC2660 drivers (which don't have the current limitations of the TMC2100) with up to 256x microstepping, and a fast 32-bit processor that can generate the step pulses fast enough.