@Danal I use the same Motors on my Rostock max for years now and they've held up quite well for the abuse I did on them. I have looked for lower inductance / inertia 0.9 steppers with good torque but I haven't found one I'm confident will perform better for a decent price (I'm looking at you moons' industries...)

If you get a chance, test out my settings I scope tuned for the motors. Mine run 1500ma without getting hot and are as silent as I can expect of them.

https://forum.duet3d.com/topic/13028/my-tuned-tmc2660-settings/2

Following the trinamic tmc2660 manual and spreadcycle guide I busted out my o-scope with a current probe and a helping hands on the sense resistor. The motors I tuned were Wantai 42BYGHM809 and a PG35L-048. I run a delta, and my steppers are running at 1.5 out of the specced 1.7A and they are staying significantly cooler than when I tuned by ear and they are behaving much better for me, it even got my past the .02 bed leveling barrier I was at.

Anyways, thought I'd share my efforts in case it might help someone.

Wantai 42BYGHM809
M569 P0 D2 F2 B2 Y01:09:02

PG35L-048
M569 P3 D2 F3 B3 Y03:07:02

@oarjjj If I'm going to spend that on a motor i would rather get a set of smart steppers

@Danal I use the same Motors on my Rostock max for years now and they've held up quite well for the abuse I did on them. I have looked for lower inductance / inertia 0.9 steppers with good torque but I haven't found one I'm confident will perform better for a decent price (I'm looking at you moons' industries...)

If you get a chance, test out my settings I scope tuned for the motors. Mine run 1500ma without getting hot and are as silent as I can expect of them.

https://forum.duet3d.com/topic/13028/my-tuned-tmc2660-settings/2

I'll start off with the caviet I am a number chaser, so this may be over the top for many...

I have several of the standard NPN normally closed ljXXa3-4-z/bx sensors from 12 to 18mm. I got them to fairly well being VERY selective with low voltage drop diodes. I was just never satisfied with their performance particularly the response on aluminum plates, the 500 Hz response time, and their spec sheet repeatability (or drift). The response time has irked me for a long time, because of this. Let's say your probe speed is 5 mm/s, that means your result can vary by .01 mm just by virtue of how fast it responds. After doing some thinking over time and just poking around with what's available, I decided I could affordably pick two of my concerns and address them. I picked up an IE5390 sensor off of E-bay for $20 (it's normally a $100+ industrial sensor). Specs for it are PNP normally open 8mm K=1( ie all metal) inductive sensor with 1kHz switching freq and 1.5mm (max) sense distance.

After getting it installed and adjusted (I mount mine on a lockable ball hinge so I can adjust to get uniform triggering in the X and Y against a small metal cylinder, every little bit matter when dealing with Delta printers), I have +/-.0015 mm repeatability when probing now*.

I'm VERY satisfied with the results and my G32 bed leveling is down to .014 (It would be better but I have mag-arm issues that I need to address next according to the ripple in G29). I believe that the response frequency was one of the primary contributors to the increased performance. You can find inductive sensors with up to 5 kHz switching frequency, but I couldn't find any good deals on an all metal one.

So I'd though I'd share my experience since I haven't seen people go into the higher quality inductive sensors out there. I hope some of you find this interesting and possibly helpful.

*Custom Rostock Max Metal, 0.9 deg steppers, Duet Wifi, 20 tooth pulleys, 0.0015625‬ theoretical microstep resolution.

Woops, 24V. That reminds me I forgot to mention that I decided on the decriment for the Wantai 0.9 steppers not because it did much to the slow / medium speed current waveform, but helped maintain currents better on the steppers at high speed when the back EMF is rampaging since there isn't much left for compensating by throwing higher voltages at the steppers

Following the trinamic tmc2660 manual and spreadcycle guide I busted out my o-scope with a current probe and a helping hands on the sense resistor. The motors I tuned were Wantai 42BYGHM809 and a PG35L-048. I run a delta, and my steppers are running at 1.5 out of the specced 1.7A and they are staying significantly cooler than when I tuned by ear and they are behaving much better for me, it even got my past the .02 bed leveling barrier I was at.

Anyways, thought I'd share my efforts in case it might help someone.

Wantai 42BYGHM809
M569 P0 D2 F2 B2 Y01:09:02

PG35L-048
M569 P3 D2 F3 B3 Y03:07:02