GRBL 1.1 Error 33

GRBL 1.1ErrorPosition is kept

A move's target is impossible, usually an arc whose end doesn't fit its centre or radius.

Position is kept. An error means the controller refused that one line or command, so nothing moved for it. (Hamrun's reading)
What to do
  1. Look at the arc (G2/G3) on the line it stopped on.
  2. Try exporting with arcs off (straight lines only), or change the CAM's arc settings.
Official GRBL 1.1 message: “Motion command target is invalid.” source

Got a different message?

Paste it into the decoder. Hamrun's editor checks your G-code before you run it, so a toolpath that leaves the machine's travel or a missing feed rate is caught before the machine stops.

Related codes

  • grblHAL Error 33: A move's target is impossible, usually an arc whose end doesn't fit its centre or radius.
  • FluidNC Error 33: A move's target is impossible, usually an arc whose end doesn't fit its centre or radius.

Official text copied from the GRBL 1.1 source on 2026-11-01. Steps and the position answer are Hamrun's reading unless marked “firmware says”. User reports are labelled CLAIMED.