Duet3D 1HCL - Closed Loop Controller Beta test

[T3P3Tony]

@supertb1 thanks for the feedback! We will have information about the production run once the shcedule is confirmed.

[MaxGyver]

I would like to give a quick thank you to everyone involved with the development of the 1HCL-Boards and the closed loop plugin.

Running my printer in closed loop is a real quantum leap for me. I can now comfortably print at speeds and accelerations that were really pushing the limits in open loop. In addition, the new level of reliability enables me to run larger print jobs for longer unsupervised periods. My printer was already very tough and reliable, but adding closed loop control fixed the last weak link in the chain.

I am eagerly awaiting further developments and improvements. For example, having linear encoders that measure the head's position on the axis independent of belts and pulleys would be the ultimate closed loop solution. But I am digressing.

Good job everyone!

Cheers Max

[A Former User]

@dc42
Hey
While you're printing with this pieces of gold, I ask myself where I can buy this board or how I can also test it?

I'm producing custom extra large toolchanger, so it would be that helpful!!
Cheers
Richard

[dc42]

@maxgyver what kinematics does your machine use? We've experienced some issues converting one of our CoreXY machines to use the 1HCL board and motors+encoders; and we don't know whether it is as issues with this particular machine+motors+encoders or a more general problem with closed loop control of coupled motors.

[A Former User]

@dc42
I have cartesian printers.
4 y motors
2 y motors
1x motor

X and Y working with a closed loop system would be nice.

Cheers
Richard

[samlogan87]

@T3P3Tony is there any news on these boards? Still keen to get 2

[MaxGyver]

@dc42 My Kinematics are IDEX (Dual Markforged aka Haq XY) with dual Y-Motors.

; Kinematics
M669 K11 Y1:1:0:-1	; Matrix mapping for Axis - X:Y:Z:U

So far, I had no mayor issues converting to closed loop.

[A Former User]

@dc42

A curious european company wanna try 1HCL.

Please provide us some information for further planning.
We need the 1HCL but we can´t wait another half a year with testing etc.

KR
Richard

[dc42]

@gruna-studio a first small production run is currently under way.

[A Former User]

@dc42
Nice, Can I pre order some?

I need to install the 1HCL with an external encoder because my machines have a double shaft on x axis.
So I can do a documentation how to place the magnetic encoder install on this board... the documentation says, that for this there will be a description in future.
Let me know.
Cheers
Richard

[dc42]

@gruna-studio so far the best results we've seen have been using motors with built-in encoders. We're also testing some motors with external encoders, but we've had some difficulties with one of them.

[tristanryerparke]

@dc42 I’d like to order some as well when they become available. Please let us know if we can pre-order.
Also, could you describe in more detail the issues with closed loop corexy that you mentioned?
I would be willing to help beta test the corexy functionality if that would help.
Thanks and look forward to the boards,
Tristan

[A Former User]

@dc42
Ok I understand.
For me it's no option to change the style of the x axis (double shaft nema17) I must work with an external encoder.
I'm happy to hear that duet will sell this board in the next months.
Would like to have a few of this little fun maker.
Please give us a sign when we can order some.
Thanks a lot
Richard

[dc42]

The first small production run of the EXP1HCL is currently undergoing testing by our assemblers. We should know more on Monday.

[A Former User]

@dc42
Sounds great!!!
Thanks for updating us

Cheers
Richard

[samlogan87]

I am keen to get two as well. I have the 48v power supply just need the boards now

[A Former User]

@samlogan87
what is the benefit of 48 volt?

cheers
richard

[samlogan87]

@gruna-studio you are able to run it much faster

[A Former User]

@samlogan87
really? the motors can drive faster?

since two years I´m working with 3d printers and duet and I never heard about it. haha

Is there a good summary from Duet?

Today is "1HCL-Monday". !!!!

cheers richard

[dc42]

@gruna-studio driving stepper motors at the desired current depends on having enough driver supply voltage to overcome the back EMF of the motors, which increases with speed. It's especially important with high inductance and high current motors. You can estimate the voltage needed using the calculator at https://www.reprapfirmware.org/emf.html.