Sudoroom has a TAZ 4 3d printer, that was donated in 2022. It should not be confused with the older TAZ 3 3d printer, which didn't work very well as a 3D printer.
According PDF Manual for the TAZ 4 the Nozzle diameter is 0.35mm (same as the TAZ3 which our extruder is from) and the bed size is X: 298 by Y: 280
All files for the TAZ 4 from Lulzbot corporation
The following "start code" (set up in the slicer's printer profile) should be used with this printer in order to properly set extruder motor current:
M907 E150
If we recompile the firmware we can put the correct default values for extruder motor current but that would be hard to do.
The extruder head from the TAZ 3 was transferred onto the TAZ 4 which will presumably make a better 3D printer. The TAZ 3 will be converted for solder paste dispensing only
The TAZ 4 uses an Ultimachine Rambo 1.3L main board and here is the correct File:RAMBo 1.3L Schematic.pdf The original 14-pin "Extruder 0" connector on the TAZ4 was removed from "Aux Power Mosfet Output" (pins 5/red,6/black), E0 Heat (pins 12,13), E0 Fan (9/black,10/red) and Ground (pin 2), and E0 (3,7,11,14). The extruder harness from the TAZ3 was installed in it.
The TAZ 4 didn't work because both Fuse F2 and F3 on the RAMBO main board were missing. They're supposed to be Littelfuse OMNI-BLOK 154 series and we didn't have any, so I stuck 5-amp F1460CT-ND in there since we have dozens of them in the FUSES bin:
After installing the TAZ3 extruder, its motor was mostly skipping. The current needed to be adjusted. There are no tiny potentiometers to adjust on this RAMBO board, only a "digipot", which is controlled with the M907 command
the default values are found in
Configuration_adv.h:#define DIGIPOT_MOTOR_CURRENT {175,175,240,135,135} // Values 0-255 (RAMBO 135 = ~0.75A, 185 = ~1A)
pins.h:#define DIGIPOT_CHANNELS {4,5,3,0,1} // X Y Z E0 E1 digipot channels to stepper driver mapping