You're stripping the printer to the frame anyway — so do it once, do it right. This is the complete field manual: every printed part with its material and color, the full hardware checklist, and the mods actually worth your filament. Sourced from Prusa's official docs and the Printables community.
The CORE One+ (shipping since Nov 2025) folds in every firmware improvement from the CORE One's first year plus three hardware quality-of-life upgrades borrowed from the CORE One L. It is not a new machine — it's the same modular platform with three sub-assemblies swapped out. Nothing is glued or welded, which is exactly why this upgrade is free if you already own the printer.
The Nextruder now drives the chamber grille automatically — open for PLA/PETG, closed for ABS/ASA/PC-CF — for an optimal thermal environment every time. No more checking the vent before a print.
A completely redesigned side sensor with a hardware switch makes loading flexible/TPU filament reliable and hassle-free. You replace the whole printed body but reuse the sensor's metal internals.
A modular bayonet-style spool holder that swaps easily for a wider 2 kg version, and doubles as the mount for Prusa's drybox. Also the base for INDX-ready indexed holders.
These 8 parts (community version) are all you print to convert to the "+". Materials are Prusa's official recommendations from the Knowledge Base. Reuse every screw, magnet and steel ball harvested from the old assemblies.
| Printed part | Material & color | Assembly | Notes |
|---|---|---|---|
| C1+ Filament Sensor Body | PETG Jet Black | Side sensor | — |
| C1+ Filament Sensor Cover | PETG Jet Black | Side sensor | — |
| C1+ Filament Sensor Lever | PETG Jet Black | Side sensor | — |
| C1+ Filament Sensor Switch | PETG Orange | Side sensor | Accent color |
| Puck Universal | PETG Jet Black | Spool holder | Bayonet base |
| Spoolholder Static | PETG Jet Black | Spool holder | — |
| C1+ UPG Vent Block B | PC-CF | Top panel | Brim recommended |
| C1+ Printhead Cover Right Lever | PC-CF | Nextruder | 3 perim · 50% infill · brim |
PETG: 0.2 mm layer · 20% grid infill · brim optional (recommended on tiny parts).
PC-CF: 0.2 mm layer · 20% grid · brim recommended. The Printhead Cover Right Lever wants 3 perimeters & 50% infill for strength. Use a hardened nozzle — carbon fiber is abrasive.
Everything metal is harvested from your existing printer. The sole new item is a rubber O-ring, 25 × 3.5 mm, for the spool holder — a hardware-store part, or print one in TPU 95A from the remixes.
Follow the Community Version upgrade manual (Prusa Knowledge Base) alongside the Printables model. The kit and community parts are geometrically identical — the kit versions are just slightly thicker to suit extra screws in Prusa's assembly line.
Since you're rebuilding from the frame up, this is the complete plastics set from Prusa's CORE One/+ printable parts model — ~799 g and ~46 h across seven print files. It already contains the "+" parts, so printing this set = a full "+" plastics rebuild in one go. Files are pre-sorted by material and color.
| Print file (bundle) | Material | Color | Covers |
|---|---|---|---|
| CORE One+ · PETG parts — black | PETG | Jet Black | Bulk of body / covers |
| CORE One+ · PETG parts — orange | PETG | Prusa Orange | Accents · switches · logos |
| CORE One+ · PC-CF parts | PC-CF | Carbon black | Hot zone (hotend / bed) |
| CORE One · PETG parts — black | PETG | Jet Black | Base printer body |
| CORE One · PETG parts — orange | PETG | Prusa Orange | Base printer accents |
| CORE One · PC-CF parts | PC-CF | Carbon black | Base hot-zone parts |
| PC parts | PC Blend | Natural / black | Select structural parts |
PrusaSlicer 0.2 mm STRUCTURAL, 15% grid infill. Prusa tested these on an MK4S inside an enclosure — but they print fine on the CORE One itself. Experiment with walls/infill for strength where you like.
Prusament PC-CF is frequently sold out. For the hot-zone parts you can substitute PC Blend, or ABS / ASA — the requirement is heat resistance, not carbon specifically. Regular PETG will soften near the hotend, so don't use it there.
Prusa's stock color scheme is Jet Black with Prusa-Orange accents, plus carbon-black for the hot zone. Match it for the OEM look, or make it yours — only the material class matters mechanically, not the brand or color.
The workhorse — the majority of every body panel, cover and bracket.
Accent parts, the sensor switch, logo inlays. A little goes a long way.
Heat-exposed parts around the hotend, heatbed and vent block. Needs a hardened nozzle.
A small handful of select structural parts in the full set's "PC parts" file.
Optional: printed O-ring, dampening feet socks, camera lens collar.
PC-CF is abrasive. Fit a hardened steel nozzle before printing the carbon parts to avoid wearing out the stock brass CHT.
Here's the key fact for your rebuild: you already own 100% of this. Because nothing on the CORE One is glued or welded, every belt, motor, rail, board and fastener comes back out of your kit and goes straight back in. Use this as an inventory checklist as you strip the machine down — bag & label each group. Every count below was extracted from the official CORE One+ manual (v2321) — the fully itemised, tick-offable version lives in the companion Excel workbook.
51 printed parts · 399 fasteners (screws/nuts/rivets/washers) · 513+ total hardware pieces · 2 GT2 belts · 6 bearings (2×LM10LUU, 2×LM8UU, 2×693-2RS) · 6 motors (3×Z, X, Y, extruder) · 50 nylon rivets · 12 GT2-20 idler pulleys. The CoreOnePlus_BOM_Checklist.xlsx workbook breaks all of it out by chapter with Printed / Bought / Installed check-boxes, plus a dedicated belts & bearings replace-list.
Mandatory: 1 × O-ring 25×3.5 mm (C1+ spool holder). Consider replacing if worn: PEI spring-steel sheet, PTFE tube + collet, any stretched belt, thread-locker, and re-lube (Prusa bearing grease ships in the kit). Everything else is reused.
A full teardown is the perfect moment to add upgrades — many are far easier with the printer already apart. These are the most popular, well-supported CORE One mods from the community, grouped by what they improve. Filter below.
by DET-Man · Voron-inspired
Replaces the M3 idler bolts in the XY gantry with 3 mm hardened steel pins to eliminate idler play and improve precision. Optional toothed-idler and heat-set tensioner variants. Parametric Fusion files included.
View on Printables →by Ed (6d6178)
Laser-scan-fitted wiper arm using cheap Bambu A1 silicone pads, with an optional magnetic purge bin. Right-arm version preserves automatic sheet detection. Free online tool generates the wiping G-code.
View on Printables →by TheDarkHood
Primes/purges the nozzle against a gantry-mounted bearing — no more purge line or tower on the bed, ever. Toolless, reversible. Great for color changes and MMU/INDX tool changes. Needs one bearing + custom G-code.
View on Printables →by Zapador
Feeds filament from the top of the printer while keeping the filament sensor working — ideal if the right side is against a wall. No permanent modification; reuses the sensor magnet & steel ball. ~30 min install.
View on Printables →Prusa Guy · fotrik · DRGRS74
Print-in-place drybox for the spool recess. Community mods add stronger 20×5×3 magnets and silicone sealing, or a plexiglass window + hygrometer + circulation fans that drop recess humidity ~10 points. C1+ puck variants exist.
View on Printables →by chips_n_Spools
OEM-style remix of the C1+ bayonet spool holder with a centered index number (1–8) — perfect for organizing a multi-spool / INDX workflow. Identical fit and mechanics, numbers only. No supports.
View on Printables →by MandicReally
Magnetic LED-strip holders shaped to nest into the CORE One's sheet-metal bends — no zip-ties or floating adhesive. Snap-in diffusers, integrated cable management, angled version lights the bed. Wire 24 V to the Buddy board (low-watt).
View on Printables →by Tinx
A magnetically-attached ESP32-CAM (OV2640 wide-angle) for remote monitoring via Prusa Connect — a budget alternative to Prusa's in-chamber camera. Prints in PETG with a TPU lens collar; needs 3 magnets + a USB-C breakout.
View on Printables →Ondrashek · eBastlir · brahoy · Aediel
The stock taped-on feet are a known annoyance. Options: Feet v2 that reuse the Prusa rubber feet, snap-on TPU dampener "socks" (6% infill), screw-mounted TPU feet, or feet with speaker-damper cutouts. All reduce noise & walking.
View on Printables →Prusa × Bondtech
The big one: a true tool-changer converting the CORE One/+ into an up-to-8-nozzle multi-material machine (4T/8T). Replaces the top lid, spool holder & feed. Full-spectrum color painting in EasyPrint. Kits from ~$749/$949, shipping through 2026.
Read the announcement →by Prusa Research
The printable route to 5-filament multi-material on the CORE One, using the proven MMU3 unit. A lower-cost, DIY alternative to INDX if you already have or want an MMU3.
See related models →community (BlueFyre et al.)
Part of the Pins-Mod family — swap smooth idlers for 10 mm toothed idlers for superior belt engagement and less skipping under fast moves. Pairs with the Pins Mod carriage variant.
View on Printables →A sane order for a full teardown-and-rebuild that folds in the "+" parts and your chosen mods without doubling back.
Slice the full parts set + the C1+ upgrade parts + chosen mods. Fit a hardened nozzle for the PC-CF/CF parts. Budget ~2–3 days of print time; bag & label bundles by assembly.
Strip to the frame, bagging fasteners per the Section 05 checklist. This is the moment to inspect belts, rails and the PEI sheet — replace anything worn. Harvest the sensor magnet & steel ball for the new sensor.
Rebuild base and back assemblies. If doing the LED or camera mods, plan cable routing now while the panels are open.
Reassemble heatbed, then the CoreXY gantry. Fit the Pins Mod / toothed idlers here if you're doing them — it's far harder later. Set belt tension.
Build the Nextruder using the new C1+ printhead cover right lever and vent block. Add the nozzle wiper / gantry primer mounts if chosen.
Wire the xBuddy, xLCD and any LED/camera add-ons. Fit the new C1+ side filament sensor and the bayonet spool holder (with the 25×3.5 O-ring).
Flash firmware 6.4.0+. Set Settings › Hardware › Chamber Vent Control › Auto to enable automatic venting. Run first-layer calibration & input-shaper. Print a test — you're now a CORE One+.
All data compiled from official Prusa documentation and Printables community models (verified July 2026).