3D Printing InfoBuild volume
300 x 300 x 300, 400 x 400 x 400 or 500 x 500 x 500 mm. Sortable value is the 300 mm kit
Advertised dimensions; check usable space and variants.
Sources & dates
- Rat Rig V-Core 4.1 product page · 2026-08 · vendor
Rat Rig V-Core 4.1
Revision of the V-Core 4 with a steel X gantry, all-metal toolhead and thicker beds on the larger sizes.
Architecture reference
Start here
Explore this printer At a glance
Nozzle temperature
350 °C maximum nozzle temperature (manufacturer claim)
Published limits; hardware and firmware limits may differ.
Sources & dates
- Rat Rig V-Core 4.1 product page · 2026-08 · vendor
Price snapshot
Not recorded in this catalog.
Dated listing, not a live offer. Read the configuration and region.
A closer look
Full specifications inside each chapterHardware, software & ownership
Understand the hardware, explore compatible changes and find a diagnostic starting point when something goes wrong. Expand the specification sections for every recorded value, condition and original reference.
Machine & motion
Dimensions, construction and the hardware that moves the print.
Model, variants & pricing3 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Manufacturer & exact marketed model name (verify the exact product identity first) | Rat Rig V-Core 4.1, described by Rat Rig as a large-format open CoreXY 3D printer kit | 1 source
|
| Variants & sibling models — and how to tell them apart (spec-contamination risk) | Three sizes, all at the same base-kit price. Acceleration is the size-dependent figure and the one most often mis-quoted: 15,000 mm/s2 at 300 mm, 12,000 at 400 mm, 8,000 at 500 mm. IDEX is a configuration option and changes the usable area per toolhead (copy mode 150x150x300 at the 300 size, mirror mode 95x95x300). Base kit excludes electronics. Rat Rig prices the base kit only in EUR (EUR 873.90 on sale from EUR 971.00, Aug 2026); no USD list price is published, so no USD street price is recorded here | 1 source
|
| Market position: superseded? successor announced? | Current revision, replacing the V-Core 4; Rat Rig sells a 4.1 upgrade kit for existing V-Core 4 machines | 1 source
|
Size, frame & enclosure5 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Build volume X×Y×Z (mm) — advertised vs actually usable | 300 x 300 x 300, 400 x 400 x 400 or 500 x 500 x 500 mm. Sortable value is the 300 mm kit | 1 source
|
| Machine footprint (mm) & clearance needed (cable/spool overhang) | 623.2 x 583 x 785 mm (300); 723.2 x 683 x 885 mm (400); 823.2 x 783 x 985 mm (500). Sortable value is the 300 mm kit | 1 source
|
| Net weight (kg) | Kit weight 35 kg (300), 45 kg (400), 55 kg (500) | 1 source
|
| Frame construction & material | 30-series aluminium extrusion; the 4.1 adds a steel X-axis gantry for rigidity | 1 source
|
| Enclosure: open / enclosed; panel material; door/lid | Open frame in the base kit | 1 source
|
Motion system1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Kinematics (bedslinger i3 / CoreXY / other) | CoreXY; Hybrid CoreXY and IDEX are configuration options | 1 source
|
Speed & acceleration1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Max acceleration (claimed, mm/s²) | Size-dependent: 15,000 mm/s2 at 300 mm, 12,000 at 400 mm, 8,000 at 500 mm (manufacturer claims) | 1 source
|
Printing system
Extrusion, heating, leveling and material handling.
Add a second independent toolhead with the IDEX kit
The official 4.1 IDEX upgrade adds the second extrusion path and its associated motion and calibration hardware. Review the full kit bill of materials and the corresponding RatOS commissioning route.
Applies to: Use the V-Core 4.1 IDEX upgrade selection for the installed size and starting configuration. Do not substitute a V-Core 4.0 parts list.
Manufacturer documentation Sources & dates
- Rat Rig V-Core 4.1 IDEX upgrade v1.00 · Checked 2026-10-20
Extruder1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Type (direct drive / bowden) & design name | Full-metal skeleton toolhead, new in the 4.1 | 1 source
|
Hotend & nozzle2 fields
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Max nozzle temp claimed AND firmware max temp limit (both values) | 350 °C maximum nozzle temperature (manufacturer claim) | 1 source
|
| Stock nozzle size & sizes included in box | 0.4 mm hardened steel and 0.6 mm included | 1 source
|
Build plate & heating1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Max bed temp claimed AND firmware limit | 120 °C maximum heatbed temperature (manufacturer claim). The 400 and 500 sizes get 8 mm thick beds in the 4.1 | 1 source
|
Cooling & filtration1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Part-cooling fan(s): count, size, ducting design | Improved part cooling, listed by Rat Rig as one of the 4.1 changes | 1 source
|
Supported materials1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Officially supported filament list | PLA, PETG, ABS, ASA, TPU, PET, PA, PC, PVA, PLA-CF, PETG-CF, ABS-GF, ASA-CF, PA6-CF, PA6-GF, PAHT-CF, PPA-CF, PET-CF | 1 source
|
Software & workflow
Firmware, controls, connections and calibration.
First-layer or configuration trouble after a RatOS migration
The migration guide calls out changed pin assignments, duplicate configuration and older Beacon-related customizations. Compare the wiring and generated configuration with the current model’s defaults before restoring custom sections.
Applies to: RatOS 2.1 RC3-to-RC4 transition. Stock-wired V-Core 4.0/4.1 kits differ from custom board and accessory layouts.
Maintainer documentation Sources & dates
- RatOS migration diagnostics · Checked 2026-10-20
RatOS: configure the Klipper stack for the installed build
RatOS supplies the printer configuration and supporting Klipper workflow. Its setup wizard distinguishes V-Core 4.0 and 4.1 and generates supported hardware options, including IDEX. Back up custom configuration and follow the documented migration rather than carrying an old configuration forward wholesale.
Applies to: V-Core 4.0 / 4.1. The RC3-to-RC4 migration requires a fresh SD-card installation; custom board wiring needs explicit pin verification.
Maintainer documentation Sources & dates
- RatOS RC3-to-RC4 migration and model selection · Checked 2026-10-20
Firmware & openness1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Firmware base & current version (Klipper fork / Marlin fork / proprietary) | RatOS 2.1 (Rat Rig's Klipper distribution) | 1 source
|
Calibration & everyday use1 field
| Property and unit | Published value and conditions | Sources and dates |
|---|---|---|
| Assembly level & time from unbox to first print | Self-assembly kit; the 4.1 ships pre-made cables that need no crimping, with rewritten step-by-step build documentation | 1 source
|
Read with context
Sources & notes
How to read this guide
This guide presents the catalog’s sourced record for this exact model. Source dates belong to each reference; a page update does not mean every specification has been rechecked.
Prices are dated listing snapshots, with configuration, regional and sale conditions. They are not current offers. Unknown values remain unfilled.
Firmware, variants and available accessories can change. Read the original reference before making a purchase or planning a process.
Catalog references1 source
- Rat Rig V-Core 4.1 product page · 2026-08 · vendor
Ownership research & coverage
Firmware, modifications and troubleshooting links are checked against the model and stated hardware or firmware revision. A creator’s compatibility claim is not a fit test by this site. Official troubleshooting describes a diagnostic route; individual reports do not establish a failure rate.
This review did not verify printable modifications for this exact model. That is a research gap, not a claim that none exist.
- RatOS upgrade and supported V-Core wiring · Checked 2026-10-20