Hi there
I've got a custom made 3D printer (Summoner v3.0) and yesterday I tried the TMC2100 drivers.
At a constant velocity you can't hear it. But when it's executing a new line/instruction, it makes an noise like an old HDD (that crrrt sound).
I've opened the Repetier software and enabled the echo mode (that's how I managed to see that only when a new instruction is executed the printer makes a short crrt sound)
No step skipping, no high-pitch noise. The drivers get a bit hot (0.7-0.8V on ref). Steppers are cool.
On this printer I've went through A4988, DRV8825 and now the TMC2100.
The reason for this upgrade is, of course, the noise reduction.
I'm running the drivers in stealthchop mode (16 uStep, with 256 interpolation). The motherboard is a RAMPS 1.4. Printing at 30-40mm/s.
I've tried playing with speeds, accels, jerkXY, feedrate, only one stepper (even with only one stepper active, the issue is still there), dry run (no PID interference), feedrate (at 25% you can really hear the independent crrt noise)
Some say the 8bit ucontroller might be the issue (the driver is controlled with a 16 ustep resolution, not 256) but that does not make much sense. The 24V supply solution is only for high pitch noise.
Any piece of advice is greatly appreciated.