@jay_s_uk said in magnetic PEI sheet - will it interfere with smarteffector?:

I use a whambam system on my predator (PEI sheet with magnetic base)

Does you print nylon filament? And if so is there any issue with adhesion? Thanks for advance.

I have not got removable PEI sheet (but consider one as a replacement) but I use geckotek3d spring steel sheet on magnet base with smarteffector for about 3 years and have no problems with it. So IMO it should be the same with PEI sheet on magnet base. BTW I would like to know how will PEI be working as my geckotek3d cover has worn and they do not produce the plate anymore. HTH

Thanks everybody who response to me! Your help is appreciated. I might contact Olsson directly but not sure they know smart effector very well. Accordingly to BPisLife remark now I am inclined to try hardened steel nozzle first.

@chrishamm : Thanks for your response! Was there anyone at the show that used Olsson Ruby with direct contact Z-probe?

I have been successfully using standard brass nozzle in E3D V6 hotend for some time and was happy. Now I am going to try some of advanced filament like CF filled nylon. They are abrasive so more hard nozzle is the must. I would like to use Olsson Ruby but not sure how it will work with Smart effector. Does it survive impacts with the hot bed during auto-calibration? Maybe someone has an experience with such combination.

As the topic starter I have just received a very generous offer from Haydn willing to send me a set of ball studs from the new batch free from charge. What's an exceptional service! Many thanks to Haydn for his hard work of improving already excellent design!

Thanks for your info!

@dc42:

I don't advise connecting multiple fans in series, because there is no guarantee that they will divide the voltage equally, especially if they are mounted in different ways so that one experiences greater resistance to air movement than the other.

Me too, I just would like to know if noctua's fans can be controlled by supply voltage PWM to use them with 12V power as they are very low noise and long lasting fans.

What is the configuration that works for you? Parallel connection with 24V-12V DC-DC converter or a series one without PWM pin? Just want to know if noctua's fan is working if controlled by PWM of supply voltage.

If I got it right you have 24V PSU so you put the fans in series. But you have no chance to make PWM control from a single signal in this configuration without quite a fancy level translator circuit. So your best solution would be like in the last post of thread you gave the link on. You should use a 24V-12V DC-DC converter. Connect its input to your PSU output and its output to power and ground pins on your fans in parallel (yellow and black wires at fan connector). Then you can connect PWM control pins of the fans to FAN0 on DUET board (or any other which are convenient for you) in parallel. This configuration should work and control fans' speed down to 20% according to datasheet.
ADD: You can try to use series connection of the fan but leave the pwm pins unconnected and connecting power supply pins of the fans to fan connector on Duet board. Then you can use standard pwm mode of Duet firmware. I don't know if noctua's fans would be speed-controlled in this configuration.