After a simulated print finished, there is a big green button in the status section to "Simulate again". I cannot think of any reason why anyone could want this.
To my understanding after a simulation the only reasonable options are either print the simulated file now or not to print the file.
I would like to suggest to change the button to a "Print Now"-button, which starts the actual print of the just simulated file.
For anyone still looking for a simple solution for those Meanwell RSP Power Supplys. Here it is.
I implemented and I tested this with my Meanwell RSP-500-24 Power Supply. It works perfectly as intended.
There is also a PCB-Layout, but I have not implemented it yet and hence it is untested.
I really like the concept of the Duet 3 Toolboard. But since I mainly use delta-printers, it is of limited use for me.
I would really like to see a new revision of the smart effector, which includes the capabilities from a Duet 3 Toolboard. It would be really awesome, to be able to reduce the number of wires going to the effector.
Currently I need 6 + 6 + 1 Wire (2x temp, 4x zprobe + 4x fan (2x2), 2x heater + fan tacho signal). With toolboard-effector it would be 2 + 4 Wires (2x Power + 4x CAN), whereby I would consider the CAN-wires actually as single cable. However, it would reduce the number of wires by at least 50%.
Are there any plans for a smart effector like this?
If not, please consider this as a suggestion for future hardware development.
I am afraid the usual thing happened when someone is asked to give full details on printer- and slicer-settings. I went thoroughly through my settings to make sure everything is consistent and reasonable. I reduced the printing speed from 90mm/s to 80 mm/s and I lowered the line width from 0.6mm to 0.45mm.
Now my extrusion problem is gone. My best guess is, that there was a back pressure problem, because of the high flow.
The result is not perfect, but I can absolutely work with it and do not have to cancel prints anymore. However, I am little afraid that this problem might come as soon as I raise the print speed. But for now I am good.
@Phaedrux Thank you for being my Rubber Duck. 
I like the temperature chart shown in DWC. But I would like it even more, if the chart would not depend on the connection between my browser and the duet board, e.g. due to bad wifi connection or a accidentally closed browser (tab) or "background browser sleep" when using DWC on the smart phone.
I suggest to have the temperature data buffered on in the web server and delivered with (let's say 10 minutes) history to the browser from there.
It seems I have not read the docs as good as I thought. The L Parameter of the M106-Command fixes my problem. This is the minimum Power for this fan.
M950 F1 C"duex.fan8+^duex.pb6"
M106 P1 C"HeatSinkFan" S0 H1 T45 L255
I found this out when investigating the fan status by running M106 P1. It only turned with 50% power.