Original Prusa MMU3 is listed in the Prusa Research filament feeder catalog. This page separates documented specifications from scoped compatibility rules, so an unlisted combination stays unverified.
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Before you rely on a result
A documented product or fit statement is only as specific as its source. Match the exact model, installed hotend, revision, and required adapter before acting.
Exact identification
Catalog ID: prusa-mmu3. Manufacturer: Prusa Research. Model or part number: MMU3.
Manufacturer-recorded specifications
Values below are only fields recorded from the linked manufacturer material. A missing value means the source set did not establish it; it does not imply zero or no limit.
| Specification | Documented value |
|---|---|
| Maximum spool count | 5 |
Model-specific notes
- Select the exact printer-specific hardware package, buffer, PTFE paths and cable. MMU3 feeding compatibility is independent of a filament being printable from a single spool.
Documented relationships
Showing 14 of 14 linked rules. The checker can inspect an exact pair and source. A verified rule may still require its listed conditions.
| Related item | Source status | Fit axis | Conditions and exclusions |
|---|---|---|---|
| Original Prusa i3 MK3S+ | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK3.5 | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK3.5S | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK3.9 | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK3.9S | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK4 | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Original Prusa MK4S | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Prusa CORE One | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Prusa CORE One+ | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile. |
| Prusa CORE One L | CONDITIONAL | feeder to printer | Use the correct printer-specific MMU3 kit, wiring harness, buffer and extruder modification.; Use matched printer/MMU firmware and the correct printer/MMU PrusaSlicer profile.; The current Prusa support page labels CORE One L support as a community modification with a dedicated guide, not the ordinary CORE One kit. |
| Original Prusa i3 MK3S | CONDITIONAL | feeder to printer | MK3S requires revised adapter/idler parts and correct PTFE setup; Prusa recommends upgrading to MK3S+ first. |
| Original Prusa i3 MK3 | NOT RECOMMENDED | feeder to printer | Original MK3 extruder hardware and firmware are not optimized; upgrade to MK3S+ first. |
| Original Prusa MK2.5 | INCOMPATIBLE | feeder to printer | MMU3 wiring harness and firmware are not compatible with this standard configuration. |
| Original Prusa MK2.5S | INCOMPATIBLE | feeder to printer | MMU3 wiring uses different power connectors and firmware is not optimized for the 12 V platform. |
Manufacturer sources
Links document the stated identity, specifications, or scoped relations. They do not represent hands-on testing by this site.
- Prusa Research — MMU3 Compatibility | Prusa Knowledge Base checked 2026-10-30; global
- Prusa Research — Original Prusa MMU3 (for MK4S/MK3.9S) - Full kit | Original Prusa 3D printers directly from Josef Prusa checked 2026-10-30; global
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