Different controller board uses different connectors for the cables to the steppermotors. We currently have 3 different options of cables. Our standard is the PC2510 connector but we also supply cables with JST-XH4 and the Dupont connector. Outside dimensions of the connectors are presented below. Further options of different types of connectors are available as customized products, please contact us if you have a need for any special connector.
Stepper motors - Supply voltage
Stepper motors are normally driven in a constant current mode by the stepper driver and since the torque a motor provides is proportional to the current all the way up to the motor’s cornering speed the supply voltage controls at what speed the cornering speed happens. With higher supply voltage the motor can be run at higher speeds than with a lower voltage; this is the reason for why we recommend to use a 24V PSU on your printer. Below image is from a very nice write-up by GeckoDrives as you can find here.
The geared Nema17 motor that is used in our QR Extruders are rated for 1200 mA (1.2A), at this current the motor will reach about 50 degrees in continues printing, when using PLA that get soft at about this temperature we recommend to lower the current for the motor to keep it cooler. The following table shows the temperature of the motor in continuous mode at each current setting.
|Current setting||Motor temperature|
As your slicing parameters, nozzle diameter, temperature and polymer type all affects your extrusion pressure you will need to use a setting that works best for you. Also one option is to attach a heat sink to the back of the motor to increase the heat dissipation to lower the temperature.
Depending of your printer and your controller different methods are used to set the correct current.
Stepper drivers that have an adjustable potentiometer is adjusted measuring a Reference voltage that corresponds to the current used. Example video of procedure. Stepperdrivers that are using a digipot can adjust the value by sending a G-code. If your system uses a digipot you normally adjust the current for the motor sending M907 Exxxx where xxxx is the current in Milliamps. So to set the current to 1000 mA for the extrudermotor send M907 E1000.
In Ultimaker you can adjust the current for the motor from the LCD-panel directly.
You can of course insert M907 Exxx to the start section of G-codes in your slicer program.