- MP Select Mini V1
- MP Select Mini V2*
* Please be sure to pay extra attention to the first "IMPORTANT NOTE" listed below.
- Heat sink (will be preinstalled). The product images do not show a heat sink installed but that was only to show off the TMC2208 steppers drivers.
- Three (3) 2 to 3 pin endstop adapters. The endstop plugs for the Select Mini V1 and V2 are 2 pin. The adapter makes it so those plugs can plug into the 3 pin header on the mainboard.
- One (1) fan adapters. The Select Mini V1 hotend fan uses a slightly larger plug than the V2. The adapter is to convert from the larger size to the smaller size that is on the mainboard.
- One (1) 4 pin cable for the display. The Select Mini V1 and V2 use the same plug size on the side that connects to the display board but the plug on the mainboard side is slightly larger on the V1. The included 4 pin cable is only needed if the printer is a V1. The cable will work with both the V1 and V2 but if your existing V2 cable is working then there is now need to swap.
- The customer will not need to provide any stepper motor information after purchasing this version of the mainboard as they had to with the other "Quiet" version. However if you believe you have a V2 or if you find that any of the motors are running hot then you may need to reduce the stepper driver current. This can easily be done using the gcode M907 command. The X and Y axis and the extruder can have the current output set using the digital trimpots (X and Y are both tied to X for setting the current). Z-axis is not adjustable.
- The examples below are for boards with 0.330 Ω sense resistors for X/Y and 0.240 Ω sense resistors for E
M907 E500 ; sets max current to ~950 mA for the extruder (Vref = 1.97 V)
M500 ; save the new value to memory
- Try these setting if you believe you have a V2 with 10 ohm motors or if a motor is running hot: (Adjust as needed)
M907 X450 ; set max current to ~540 mA for the X and Y axes (Vref = 1.51 V)
M907 E425 ; set max current to ~620 mA for the extruder (Vref = 1.29 V)
M500 ; save the new value(s) to memory
- Try these setting if you believe you have a V2 with 2 ohm motors or a V1: (Adjust as needed)
M907 X530 ; set max current to ~800 mA for the X and Y axes (Vref = 2.21 V)
M907 E425 ; set max current to 620 mA for the extruder (Vref = 1.29 V)
M500 ; save the new value(s) to memory
- Firmware defaults are:
M907 X400 E425
X/Y: ~410 mA (Vref = 1.14 V)
Extruder: ~620 mA (Vref = 1.29 V)
Z: ~640 mA (Not adjustable)
The text below is from the previous "Quiet" mainboard product description but most/all applies to the new version with the exception of being able to add variable resistors upon request because there is no need to do this via hardware since the firmware supports adjusting the max motor current with the M907 gcode command.
Here is a Google Photos album with videos and a couple pictures that show off the TMC stepper drivers. Some pictures show variable resistors which will not be on the mainboards because they are not needed but can be added for an additional cost if they are wanted.
Basically it will make the printer much quieter when printing. There fans will be the loudest part of the machine and then maybe a little bearing noise but that will vary from printer to printer.
I will not claim that swapping the stock A4988 stepper drivers with TMC2208 stepper drivers will make prints come out better or print faster. I will say that this upgrade will make the printer much quieter without loss of quality or speed. No firmware modifications are needed. No hardware changes have to be made by the user to accommodate the upgraded stepper drivers. As far as the user is concerned all is the same in regards to hooking up the board and printing with the same slicer settings as used before.
NOTE: The TMC2208 drivers are running in "legacy mode". The TMC2208 will interpolate received step signals to 256 microsteps. UART is not available in legacy mode.