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My Mac doesn't detect my laser engraver

Connection & setup · Updated: July 21, 2026

If your engraver doesn't appear in Lùmen's device list, the problem is almost always before Lùmen — at the USB connection itself. When macOS doesn't see the controller as a serial device, there's nothing the app can connect to, so the device picker stays empty.

Here's how to track it down, starting with the most common cause on Macs.

Most common cause on modern Macs: the USB-C connection

Some engraver controllers — the Creality Falcon 10W is a known example — leave out a small resistor that Apple's USB-C ports require to recognise a connected device. Plugged directly into a MacBook's USB-C port, the controller simply never shows up: macOS never creates a serial port for it, so Lùmen has nothing to list.

The fix: connect the engraver through a powered USB hub (or a good USB-A → USB-C adapter/hub). A decent hub provides the missing signalling, and the engraver is usually detected the instant you plug it in — both by macOS and by Lùmen. One user solved this with a 4-port Anker USB hub: the engraver was recognised immediately.

This is a hardware/electrical issue on the controller board, not a fault of Lùmen or of your data cable. It affects other budget controllers too, not only the Falcon.

Full checklist

If a hub alone doesn't do it, run through these in order:

1. Use a data cable, not a charge-only cable.
   Many USB cables (especially the ones bundled with devices) carry power but no data. Swap in a known-good data cable.
2. Try a powered USB hub or a different port.
   As above — this fixes the USB-C detection issue on Macs and also rules out a weak or flaky port.
3. Check that the machine is powered on and, if it has a separate data/power switch, that data is enabled.
4. Install the USB-to-serial driver if needed.
   Most GRBL controllers use a CH340 or CP210x USB-serial chip. Recent versions of macOS recognise many of these out of the box, but some boards still need the manufacturer's driver installed. If the engraver never appears as a serial port on any cable or hub, install the matching driver (CH340 or CP210x), then reconnect.
5. Reconnect and re-open the device list.
   After changing cable, hub, or driver, unplug and replug the engraver, then re-open the device picker in Lùmen so it re-scans.

How to tell it's working

Once macOS sees the controller, it appears in Lùmen's device list (typically as a usbserial / usbmodem entry). Select it, press Connect, and Lùmen reads the machine's configuration automatically — you'll see the connection go active and the work area populate. From there you're ready to home, set your origin, and run a job.

Related guides

Setting up a specific machine from scratch? See the step-by-step setup guides for Sculpfun, Atomstack, Ortur, NEJE, and TwoTrees engravers on Mac. Connecting over the network instead of USB? See how to connect a laser engraver over WiFi.

Still stuck?

Reach out to support with your engraver model, your Mac model and macOS version, and which cable/hub you've tried — that's usually enough to pin it down quickly.