Quick answers and fixes for common issues
No. Lùmen reads the work area and maximum power from the machine itself when it connects, so the preset is only a starting point. Pick a similar one, or save your own in a minute.
The engraver doesn't show up in the device list? It's almost always the USB connection — charge-only cables, USB-C quirks on modern Macs, or a missing serial driver. Here's how to track it down.
Connect fails or times out? Check the controller type, the network, the IP and port, and the macOS Local Network permission — in that order.
The head drives to the edge of the machine instead of your workpiece? That is a machine with no homing cycle — it has never found the corner of its own bed. Two clicks to fix.
You press ↑ and the head goes right, left or toward you? The machine sits turned on your table, and GRBL can't swap its axes. Turn it in Lùmen with one button — or switch on Mirrored if it's a mirror.
The machine answers error:20, or the pump stays silent with no error at all? The first is a firmware limit, the second is wiring — here's how to tell them apart.
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