Extruder Upgrade assemblies ??

[EagleSeven]

Well, I got these extruders after almost 2 weeks
and found problems with them.

The stepper-motors just click and will not Turn!
The motor shafts are about 1 centimeter Too Long,
and there is No flat in shaft for the set-screw.

Both motors received do the same thing, so it's not just a single defective motor.
I do know that not all Nema-17 motors are made the same internally,
and some require higher voltages and currents than others.
So, I think the problem is that these motors do Not match the settings in printer's Firmware.
The CTC motherboard does not have adjustment pots, like some older printers did.

If changing Firmware is the only way to get these motors to operate,
then they are Unusable in our printer !

I would not mind modifying the motor-shafts, if I can get them to operate.

I will install the extruders on some good motors though,
and see how they operate, after I get this problem resolved with the Seller.

[EagleSeven]

I'll probably keep these steppers for a robotics project I've been planning,
using an Arduino kit controller board.

Just too much trouble to try to send them back for a refund !
Since they are part of a kit and I want to keep the other parts in kit.

But now I'm concerned about how I can determine which Nema-17 motors will work in this printer
and which will Not, if I ever need to replace a failed motor ???

They all Look similar but evidently have Big differences Inside !

[EagleSeven]

The seller thinks the motor Connectors are wired differently !

I'm certainly not going to change wiring in our printer
to try to match connector wiring in his motors !

And I doubt they can be changed Inside the motors .