I want to make my Q2 as quiet as possible. I already have a plan for fan noise.
For stepper motor noise: has anyone here tried adding dampers to their Q2? If so, which ones and did they reduce the sound level? Was it trouble-free, or did it cause any new issues?
Here's a Teaching Tech video about dampers, in case you aren't familiar with them: https://www.youtube.com/watch?v=vu80vctXaxQ
My robot (J15 Pro Ultra) is connected to a WLAN without Internet access, hosted by an OpenWRT router.
If I connect my laptop to the same WLAN, I can do this:
$ ntpdate -q 192.168.3.1
2026-05-08 20:44:35.920519 (+0100) -0.005088 +/- 0.002602 192.168.3.1 s2 no-leap
I think this means my OpenWRT router is acting as an NTP server reachable at 192.168.3.1 . Correct me if I'm wrong.
However, in the Valetudo web interface, if I go to (Menu icon) > Connectivity > NTP Connectivity and set the "Server" field to 192.168.3.1 and then press the refresh icon, I get Error: connection Timeout waiting for NTP response from 192.168.3.1:123.
What am I doing wrong?
I'm contemplating a DIY air purifier build that needs to be compact and would involve a duct, so needs good static pressure. For VOCs and UFPs (enclosure for a couple of 3D printers running PLA, ASA, PETG, PHA, TPU, roughly 1m3).
I'm after Noctua-level quietness (20dBA @ 1m would be great), but higher static pressure.
I've read that centrifugal ("blower" or "squirrel cage") fans generate higher static pressure per Watt than axial fans (PC cooling fans) of the same size.
I hope to use just one fan, 120-140mm diameter and 20-40mm thick. Ideally 12V, but 5V or 24V would be OK. Budget would be max £100 for the fan. Power budget: hoping for <10W in normal usage.
PC fan manufacturers are OK at publishing at least basic specs for SPL and static pressure, and popular fans get scrutinised by reviewers so it's easy to find fans that are effective and quiet.
It's a different story with centrifugal fans. I haven't found many reviews. Brands like Sanyo Denki have good data sheets for PWM, static pressure, and airflow, but just give a maximum value for noise instead of a curve. For instance, this Sanyo Denki fan: datasheet. Maybe they're really quiet at 50% PWM? I can't tell from the datasheet.
Does anyone here have info on noise/sound-level vs static pressure values for centrifugal fans? Or recommended manufacturers?
This would be for a project in the UK, if it matters.