Good day! Sorry, my English is bad (Im from Russia), but I want share with you my upgrade: Arduino mega 2560 with Ramps 1.4+a4988+Marlin 1.1.9
Printing layer: 0.05mm. Very good result!!!
I cant show good photo with test printing now ((( Later.
a4988 work hush than with stock drivers on original motherboard. In future I try replace tmc2100.
- Buy mega with ramps 1.4.
- Replace fuses on ramps pcb
- Tuning a4988 on 0.28v VREF
- Made and Soldered PCB amplifier for extruder thermo sensor (I think, in UP! Mini PT100) on LM358 and calibrate it in marlin firmware (mini PCB in hand on photo)
- Tuning firmware.
- And more time
All works wery good!
And I can sell my old motherboard with cpu (fully worked)