@dc42 thanks for your answer.

Regarding the servo speed control, I have found a small additional module (CTI Servo Actuator Travel-Tip-Delay) with which you can set the running time between start and end position in 8 steps between 0 and 8 seconds. Could I use this in conjunction with the Duet hardware? This would give me a simple way of regulating the positioning speed.

Thanks for the answer.

One more question about the Duet 3 Toolboard 1LC: If I want to operate 6 toolheads (extruder + hotend + servo), then I need

• 1 Duet 3 Mini 5+
• 6 Duet 3 Toolboard 1LC

Have I understood this correctly?

Another question in advance: if you control the servo via the G-code commands M280, can I influence the speed at which the servo moves to the end position?

If this does not work directly, are there any workarounds or components to achieve this?

The servo is to drive/move a mechanism and the speed should be such that the mechanism is accelerated or moved normally and not jerkily. For the complete movement 1 - 3 seconds would be sufficient.

@dc42 First of all, thank you for the detailed answer.

There will always be a trio - a hotend always has an associated extruder and an associated servo. The extruder and the servo will be placed relatively close to each other, as both have a Bowden system.
With regard to the voltage for the servo, the scenario is as follows: one servo is moved to the home position, the next servo is moved to the working position, so two servos are controlled one after the other per process, not simultaneously. However, it is not a problem to provide an additional voltage source for the servos.
I think a Duet3 main board should be the right choice. As I can read in the specs, the 6XD would have enough capacity for 6 servos, is that correct?

I am relatively new to the subject of printer control hardware, i.e. mainboard, wiring, firmware etc., I have only assembled and tuned kit printers so far. I now want to try out an idea and upgrade a used, but mechanically well-functioning printer with a new mainboard and my own extensions.

I'm sure I'll have questions during the project, I think I've come to the right place.

Thanks in advance for your help.

Hello everyone,

I would like to try something out and need the following functionality:

• Heating up to temperature xxx° of Hotend_1
• Activate extruder_1
• Cool down all hotends to temperature xxx° except Hotend_1
• Move the SG90-Servo_1 for mechanical positioning

Until

• Heat up to temperature xxx° of Hotend_n
• Activate the extruder_n
• Cool down all hotends to temperature xxx° except Hotend_n
• Moving the SG90-Servo_n for mechanical positioning

During my research I found out that the RepRapFirmware is suitable for this, with which I can control/activate the hotends and extruders.
Now I am looking for a suitable Duet3D mainboard with which I can control several (max. 8 ) SG90 servos.

The board should support the connection of up to 8 SG90 servos.

Which board would be recommended? 6 servos would also be sufficient if 8 are too many.

Many thanks in advance for your help.