Creality Ender 3 Stock Factory Vref

README.md

Creality3D v1.1.2 stock vref values

A4988 Drivers
Vref set to ~90% of stepper rated current
Rs = 0.1ohm

X = 0,58v (0,725A)
Y = 0,58v (0,725A)
Z = 0,58v (0,725A)
E = 0,72v (0,900A)

Stepper Motor datasheets

Naming: [JK][S]HS[L]-[100][4]

JK: Manufacturer (jkongmotor) S: Size (42mm) HS: Hybrid Stepper L: Length (34/40mm) 100: Rated current 1.00 4: Number of wires

• X, Y, Z: 42x34 1.8deg 0.84A 4xwires jk42hs34-0844 yal8-23

• E: 42x40 1.8deg 1.0A 4xwires jk42hs40-1004a-02f

• http://www.jkongmotor.com/Product/42HS-NEMA17-2Phase-Stepper-Motor-1-8%C2%B0.html

• https://jkongmotor.en.made-in-china.com/product/pvdJZFXCiRks/China-Jk42hs40-1704-NEMA-17-3D-Printer-Stepper-Motor-42mm-Reprap-Motor.html

References

• https://reprap.org/wiki/Pololu_stepper_driver_board
• https://reprap.org/wiki/A4988_vs_DRV8825_Chinese_Stepper_Driver_Boards

I can't speak to "usually". It's often as high as 90%, and it can be set much lower to save a little power if you aren't running a race printer. Feel free to adjust it downward until your printer starts losing steps, then back up until the step loss disappears.

Then pop a note into the control board compartment to remind yourself of that adjustment in case you ever get the Need for Speed and want to adjust it higher again.

@MaxMishchenko any chance you can reach out to your contact and see if they have details for the BJ42D15-26v12?

@MaxMishchenko any chance you can reach out to your contact and see if they have details for the BJ42D15-26v12?

I've specs Here for both BJ42D15-26V12 and BJ42D15-26V19 (This is the same spec as the BJ42D15-26V02 hence drawing ID matching)

@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.

Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?

@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.

Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?

It’s the same thing…
1A/1.414=0.707A
1A*0.707=0.707A

Hi. I think you're wrong pal. I remember the electronic classroom in the first year and say0.707. i find this:

How to calculate RMS value of current?

Then, the RMS voltage (VRMS) of a sinusoidal waveform is determined by multiplying the peak voltage value by 0.7071, which is equal to one divided by the square root of two (1 / √2)

Dividing something with 1.414 is the same as multiplying something with 0.707. I’m not smart enough to see what the problem is. Hopefully some one else can help you.

Anyone familiar with the first version of the Sprite extruder that just screws on to a stock ender 3 x-gantry plate? BJ42D09-20V01 model number on stepper. Can't find anything on it. I'm running it at .8a, still cool to the touch tho so I'm hoping the documents here apply?

Since this thread is now kind of a database for all sorts of stepper motors, I'm also adding these for reference for others. I have those on my Ender 3 Max. I got the datasheets directly from the manufacturer Kelimotor by asking the sale assistant.

BJ42D16-26V09 -> apparently the same as BJ42D15-26V09
BJ42D15-26V09

BJ42D15-26V12

BJ42D22-23V01

https://drive.google.com/file/d/10bUmRyaTjHy4UPEDfP2xxpU4MgqT2sci/view?usp=sharing

Here is the BJ42D15-26V10 that i got from them, seems like the actual motor specs are the same as most of these so far.