1 · How many axes?
The extra motor channels (M3, M4) become A/B axes or a dual-motor gantry.
2 · Dual-Y gantry?
A second Y motor (Y2) drives the other side of a gantry. It runs on a spare motor channel.
No — single Y motor
One motor per axis. Standard machine.
Dual-Y, one switch
Both Y motors move together and share a single home switch. No self-squaring.
Dual-Y, self-squaring auto-square
Each Y motor homes to its own switch, so the gantry squares itself. Needs two Y home switches.
5-axis uses both spare motor channels for A and B — no channel left for a dual-Y motor.
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How to flash
- Hold the BOOT button, plug in USB-C — the board mounts as an RPI-RP2 drive.
- Drag the .uf2 onto that drive. The board reboots into grblHAL automatically.
- Or use RectaControl → Firmware and pick the .uf2 — no button-holding needed.
✓ Every build is fully-loaded
This picker only chooses kinematics. Every firmware ships with the board's full feature set — 0-10 V analog spindle, Huanyang / Delta / generic Modbus VFD drivers, laser mode, coolant/mist/vacuum, all isolated inputs, Ethernet, USB-C, microSD and the RS-422 pendant — and you pick which to use at runtime. All motion tuning — steps/mm, speeds, travel, soft/hard limits, homing, VFD choice — is done in RectaControl after flashing. No config file to hand-edit.
Need a different setup?
Dual-X or dual-Z gantry, a non-squaring 4-axis, or something more exotic? Any kinematics the board physically supports can be built to order — just tell us your machine.
Request a custom build →