Best Voron Mainboards 2025 — BTT Octopus vs SKR vs Manta vs Fysetc

Electronics Comparison Mainboard

The mainboard is the nervous system of your Voron printer. It controls every stepper motor, powers the hotend and heated bed, reads thermistors and endstops, and manages fans, LEDs, and add-ons like CAN bus toolheads. Picking the wrong board means insufficient driver channels, cramped wiring, or limited expansion for future upgrades. Last updated: May 2025.

In this guide, we compare the five most popular mainboards for Voron builds: BTT Octopus Pro v2, BTT Octopus v1.1, BTT SKR 3, Fysetc Spider v2.2, and BTT Manta M8P (with CB1 compute module). We cover stepper driver count, maximum current, fan headers, thermistor inputs, probe support, CAN bus readiness, form factor, and real China-direct pricing.

At a Glance — Mainboard Spec Sheet

BTT Octopus Pro v2 — The Flagship

The Octopus Pro v2 is BigTreeTech's flagship Voron mainboard. It supports up to 8 stepper drivers with a maximum current of 2.4A per driver (using TMC5160s), making it the most powerful board in this comparison. It has dual Z support with independent endstops for each Z motor — essential for quad-gantry leveling (QGL) on the V2.4. The onboard CAN-FD transceiver lets you connect a CAN toolhead (like the EBB36/42) without any add-on boards.

Pros: Eight full driver slots — enough for V2.4 (X, Y, Z1, Z2, Z3, Z4, E0, E1) with dual extruders. Dual Z endstop headers for independent Z motor homing. CAN-FD onboard with a dedicated connector. Six fan headers (four PWM controllable). Five thermistor ports. The v2 revision fixes the USB-C power delivery issues present in earlier batches and adds better ESD protection on the stepper driver sockets.

Cons: Large form factor (170x100mm) — requires careful case planning. The TMC5160 drivers run hot and need active heatsinking. Power connector placement can be awkward in a LDO or Formbot electronics bay. Overkill for smaller Voron builds like the V0.2 or Switchwire.

Best for: Voron V2.4 350mm builds, large-format Vorons (V2.4 350+), dual-extrusion setups, and builders who want maximum expansion headroom. If you plan to add a CAN toolhead, multiple chamber heaters, or RGB LEDs, the Octopus Pro has the ports and power delivery to handle it all.

BTT Octopus v1.1 — The Proven Standard

The Octopus v1.1 is the board that built most of the Voron V2.4s in existence. It's been the community favorite since 2021, and for good reason — it's well-designed, well-documented, and widely available. Like the Pro, it offers 8 driver slots, but with a slightly lower maximum current of 2.0A per driver, which is still sufficient for TMC2209s (the most common Voron driver).

Pros: Excellent community support — every Klipper config template includes Octopus pin mappings. Eight driver slots handle any Voron configuration. Two independent Z endstop ports for V2.4 QGL. Four thermistor ports cover hotend, bed, chamber, and one spare. The 12V/24V fan headers are clearly labeled and independently switchable. Widely available from every Voron parts supplier.

Cons: No onboard CAN-FD — you'll need an external CAN hat or UART-to-CAN adapter for CAN toolheads. Only four fan headers (many V2.4 builds need five: one for electronics cooling, one for the part cooling fan, one for hotend fan, one for chamber fan, and one for a nevermore filter). The v1.1 uses a STM32F407 chip which has adequate but not excessive processing power.

Best for: First-time Voron builders on a V2.4, Trident builds, and anyone who wants a board that "just works" with years of community testing behind it. The Octopus v1.1 is the safe, proven choice.

BTT SKR 3 — Compact and Capable

The SKR 3 is BTT's five-driver board in a compact form factor. It uses a more modern STM32G4 chip with double the clock speed and hardware floating-point unit compared to the Octopus's F407. The smaller size (140x100mm) makes it ideal for tight electronics bays, and five drivers are enough for most Voron models.

Pros: Compact form factor fits easily in V0.2 and Switchwire electronics compartments. Five drivers cover V0.2 (X, Y, Z, E) and Switchwire (X, Y, Z, E) with one spare. The STM32G4 processor is noticeably snappier in Klipper — macro execution and math operations complete faster. Three thermistor ports are enough for hotend, bed, and chamber. Dual Z headers (not independent endstops, but two Z drivers shared on one stepper).

Cons: No CAN. Five drivers are insufficient for V2.4 quad-Z builds or dual-extrusion setups. Only three thermistor ports — no spare for an enclosure temperature sensor if you're also using bed and hotend. No dedicated probe port (you'll need to use a spare endstop header). Limited fan headers compared to the Octopus.

Best for: Voron V0.2 builds, Switchwire conversions, and budget Trident builds (if you don't need dual extrusion). The SKR 3 is also an excellent secondary board for managing a toolhead CAN bridge or chamber controller in a larger Voron setup.

Fysetc Spider v2.2 — The Kit Standard

The Fysetc Spider v2.2 is the board most commonly found in Voron kit builds (Formbot, Fysetc, and some LDO kits). It's an 8-driver board with a slightly different layout than the Octopus, with features specifically designed for Voron printers. The Spider has been through several revisions, and the v2.2 is the most mature and reliable.

Pros: Eight drivers handle any Voron configuration. Dedicated Voron wiring — the terminals are laid out to match the Voron wiring spec, making cable management cleaner. Dual Z endstop headers for V2.4 QGL. Onboard 12V/24V buck converter so you can power the logic from 24V without an external PSU. Three independently fused fan outputs (always-on, controlled-chamber, controlled-part). Good community support from the Voron Discord.

Cons: No CAN-FD onboard. The firmware flashing process is slightly more involved than BTT boards — you need to set jumpers for the correct DFU mode. The heat sink on the Spider is not as effective as the Octopus Pro's — TMC5160s tend to run hotter. Fewer PWM fan headers compared to the Octopus. Some early v2.2 batches had quality control issues with loose terminal blocks.

Best for: Builders using a Formbot or Fysetc kit who want to keep the bundled board and save money. The Spider v2.2 is a capable board — it just lacks some of the polish and expansion options of the Octopus series. If you're on a strict budget and building a V2.4, the included Spider works well.

BTT Manta M8P — Integrated Compute

The Manta M8P breaks the traditional mainboard mold by integrating a compute module (CB1 or Raspberry Pi CM4) directly onto the board. This eliminates the need for a separate Raspberry Pi — the Manta is a "mainboard + Klipper host" in one package. The M8P variant has 8 driver slots and onboard CAN-FD.

Pros: No separate Raspberry Pi required — the CB1 module (quad-core Cortex-A53, 2GB RAM) runs Klipper, Moonraker, and Mainsail/Fluidd smoothly. The integrated CB1 mounts directly to the board via a 100-pin connector, eliminating USB and power cables between the Pi and the mainboard. Onboard CAN-FD for toolhead communication. Five fan headers (three PWM). Clean, modern layout with color-coded terminals. Five thermistor ports. The CB1 module costs ~$20-25, making the total board + compute package cheaper than an Octopus + Pi 4.

Cons: If the CB1 module fails, you lose both the Pi and the mainboard interface (though the stepper portion still works over USB from an external Pi). CB1 software compatibility is good but not as thoroughly tested as Raspberry Pi OS — some Klipper plugins have minor issues. The Manta + CB1 draws more power from the 24V rail than a standard board + separate Pi. Firmware updates for the CB1 require slightly different workflows than standard Pi updates.

Best for: Trident builds (the Manta fits perfectly in the Trident's electronics compartment), new builders who want a clean all-in-one solution, and anyone building a Voron in 2025 who wants the latest integrated architecture. The Manta M8P + CB1 is our recommended combo for the Trident.

Stepper Driver Selection — TMC2209 vs TMC2240 vs TMC5160

The stepper drivers you choose are just as important as the board itself. Here's how the three main options compare:

• TMC2209: The Voron standard. 2.0A max current, UART control (stealthChop and spreadCycle modes), stallGuard2 for sensorless homing. Quiet, efficient, and proven. Runs cool enough to use without heatsinks at typical Voron currents (1.2-1.5A for X/Y, 1.0-1.2A for Z). Price: $5-8 per driver China-direct. This is the best choice for 95% of Voron builders.
• TMC2240: The upgrade from TMC2209. 2.6A max current, better thermal performance, and more advanced current control (CoolStep, StallGuard4). Draws slightly less power than the 2209 at the same torque output. Useful for high-torque Z motors on large V2.4s, or if you're running 0.9° steppers that need higher current. Price: $10-14 per driver China-direct.
• TMC5160: The high-power option. 2.8A max current with external MOSFETs for superior thermal handling. Designed for large-format printers with heavy gantries. Overkill for most Voron builds — the 2209 and 2240 provide plenty of torque for Voron-sized beds. Runs hot, requires active heatsinking, and is significantly more expensive ($18-25 per driver). Only recommended for 350mm+ V2.4 builds with heavy print beds or dual extruder heads.

Our recommendation: TMC2209s for all axes on any Voron build. If you're building a 350mm V2.4 with a glass bed and heavy toolhead, consider TMC2240s for the Z axes. Skip TMC5160s unless you're building a custom extra-large Voron or running a heavy dual-extrusion toolhead.

Installation Tips for Each Board

Octopus Pro v2 / Octopus v1.1

• Flash via DFU mode: hold the BOOT button while plugging in USB, then use make flash FLASH_DEVICE=0483:df11 in Klipper
• Wire Z endstops to STOP_1 and STOP_2 for independent Z homing on V2.4 — do not jumper them together
• The 5V and 3.3V outputs are limited to 500mA total — don't power your Pi from the Octopus if you have a power-hungry Pi 5 or Pi 4 with USB accessories
• Use the dedicated 24V fan headers for part cooling fans (they can handle 1A each), and the always-on fan header for electronics cooling

BTT SKR 3

• Flash via SD card — copy the compiled klipper.bin to a FAT32 SD card, insert it, and power on. The board renames the file to FIRMWARE.CUR on successful flash
• Only one Z endstop port — for dual-Z Trident builds, wire both Z motors to the same driver and use mechanical bed leveling (Z tilt adjust won't work with only one Z endstop)
• The probe port is shared with the Z endstop — you'll need to set endstop_pin: probe:z_virtual_endstop in Klipper config
• Heatsinks are recommended on all drivers if running above 1.4A RMS

Fysetc Spider v2.2

• Flashing requires setting the boot jumpers (BOOT0 to HIGH, then power cycle, then flash via DFU). After flashing, return BOOT0 to LOW and power cycle again — a step that catches many first-time users
• The fused fan outputs are rated at 3A each, but the total fan draw should not exceed 6A on the 24V rail
• The thermistor ports use a 4.7k pull-up resistor — compatible with standard 100k NTC thermistors (the Voron standard)
• The Spider's layout runs the stepper motor wiring along the right side of the board — plan your cable routing to avoid crossing high-current AC wiring

Manta M8P (with CB1)

• Flash the CB1 first, then the mainboard. The CB1 ships with a generic Armbian image — flash a Klipper-specific Armbian build or use the BTT pre-built image from their GitHub
• The CB1 mounts on the underside of the Manta board — ensure adequate clearance in your electronics bay (about 15mm below the board)
• CAN-FD is pre-configured on the Manta — connect your CAN toolhead to the dedicated 4-pin header and set the toolhead's CAN speed to 1,000,000 baud to match the Manta's default
• Power the Manta from a dedicated 24V supply (not the Pi's 5V). The CB1 draws its power from the mainboard via the 100-pin connector

Recommendations by Voron Model

Voron V2.4 (all sizes): BTT Octopus Pro v2 or Octopus v1.1. The V2.4 needs four independent Z drivers for quad-gantry leveling, plus X, Y, and E0 — that's seven drivers minimum. The Octopus gives you eight with room for a second extruder or an IDEX toolhead later. The Pro's CAN-FD is a bonus if you plan to run a CAN toolhead.

Voron Trident: BTT Manta M8P + CB1. The Trident uses three Z motors on a single driver with Z tilt adjust, needing only five drivers total (X, Y, Z, E0, spare). The Manta's onboard CB1 eliminates Pi wiring, and the Trident's electronics compartment was practically designed for the Manta's form factor.

Voron V0.2: BTT SKR 3. The V0.2 only needs four drivers (X, Y, Z, E0) plus one spare. The SKR 3's compact size fits perfectly in the V0.2's tight electronics compartment. Pair it with TMC2209s in UART mode for silent operation.

Voron Switchwire: BTT SKR 3. Same logic as the V0.2 — four drivers needed, and the SKR 3's size fits the Switchwire's limited electronics space. If you're converting an Ender 3, the SKR 3 can even reuse the existing 24V PSU and wiring.

Budget builds (any model): Fysetc Spider v2.2. If you're sourcing parts from Formbot or Fysetc kits, the included Spider is perfectly adequate. It won't stop you from getting excellent print quality — it just has fewer convenience features than the BTT options.