Have anything changed in FluidNc since that response from Bart himself?
I have my machines fine tuned and i cut circles that are really circles. 
Provide a material/use case you want to use.
At the price of building a lowrider you cant expect HAAS LATHE quality parts.
The jackpot controller was designed with tmc2209 in mind and that is what we use.
There are others fliudnc boards that will work directly with external steppers. You may want to look for them and avoid any issues they are cheap too
nope
Then you should do that.
This one, for example, was done with the LR3 still, the 4 is even more accurate.
My 3D printer is accurate to sub 0.1mm using belts so I disagree.
As is the drop bed laser cutter at work.
This is from the manual of the HB808C:
What is called controller is your Jackpot with the previous ports mentioned.
Iâve got no idea, I donât own a jackpot.
I think you a) need some glasses and b) need to be able to draw circles with a pen before complaining about circles made in aluminium.
Everyone in this forum is always really supporting, providing you with examples why you are probably wrong and all you do is being snide about it without having ever posted your machine or having asked for help with it. You are jumping to wrong conclusions and everyone tries to tell you nicely you are wrong.
If you think you can design a better CNC for the same money or make X better, do so. @Brute71 did his own thing and his CNC looks awesome as well.
A lot of us are trying out different stuff to improve the LowRider, but mostly after we have worked with the machine for a while.
So Iâd kindly ask you to take a step back, make a build thread and show us what youâve got so far so we can help you with it. If, after a while, you are still not happy you are going to have enough experience to actually say what the problem is without wildly speculating and throwing around buzzwords you have read somewhere else.
Thanks. 
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And that is what is really important, you need to know that you need to get better (in your use case) first with experience. The mayority of mods only improve some qol things (dragchains, dust shoes etc) major mods are not that common
I was just remembering, I donât think external drivers will work with the Jackpot. I think itâs using 3.3v signals and external steppers need 5v. It could be a case where they might work at 3.3v but not designed to.
http://wiki.fluidnc.com/en/support/external_stepper_motor_drivers
It also notes you shouldnât mix TMC drivers and external drivers. Thatâs in reference to a different board but talking about using 5v.
I would definitely recommend that you post more details about your machine. It sounds like you have some issues to resolve before you venture down these advanced paths. If the machine is not properly setup and calibrated, adding closed loop steppers isnât going to magically solve all your problems.
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To be mounted on existing nema 17 steppers and Jackpot
And provide level shifting from 3.3V to 5V IO.
Also provide ESD protection so you donât blow up the ESP-32 in the jackpot.
I have a set of closed loop steppers, and a pile of jackpot boards, but there are details- like ESD protection- that have prvented me from testing this (yet) on X my LR4. Y and Z present packaging issues.
Interesting. That link didnât work for me but I see a couple versions here.
And cpmplete github wiki
@nerejac Again, what machine you have and why you need such high speeds? You arenât going to be cutting at those speeds
It looks you want some help with it, thatâs not a setup we run here.
Testing can be don for sure but not everyone have an extra board and a complete kit of steppers with encoders to test/sacrifice.
There are two people here @CesarH with purple avatars both. Rene tries to be helpful.
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True my bad. Will fix it thanks
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didnât noticed itâŚ, not native English ⌠will change avatar to grumpy old man
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Just get some circles done with a pen before criticising anyone else lol.
I guess you didnât take Ryanâs warning to heart. See you. 