{Greg}
There are options to converting existing steppers to closed loop feed back.
The LCNC software/hardware option would be to add an encoder and run the
stepper in velocity mode. This does not offer the many advantages of the direct
feedback drivers.
Then for small steppers there is the Mechaduino bolt on option. Buy direct from
https://tropical-labs.com/
https://hackaday.com/2016/06/01/mechaduino-closed-loop-stepper-servos-for-everyone/
https://github.com/jcchurch13/Mechaduino-Hardware
https://github.com/jcchurch13/Mechaduino-Firmware
The latest firmware release was 26 November 2018 so this is not a dead item.
If someone were to build on this open source project and produce a unit with a
50VDC / 6A working power capacity it could cover most steppers.
IIRC Gecko drive was once working on this idea and had it working, I think
maybe it was not released because it was not economical and would not match
performance of matched motor drive combos, but that is just my speculation.
I would like to get one of the matched motor/driver units and see if the
encoder could be replaced with a unit which included a index channel.
{/Greg}
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