Thank you for purchasing the Prusa CORE One kit. Your package includes parts for both CORE One and CORE One+. If you want to assemble the CORE One+, this article will guide you through the upgrade process. Some parts look similar, but only the upgraded versions must be used for CORE One+.
- To assemble the CORE One, follow the instructions in the manual available at prusa.io/core-one.
- To assemble the CORE One+, follow the instructions in the manual at prusa.io/core-one-plus and use this article as a supplement.
Note: If a part or step is not explicitly mentioned in this article, follow the standard CORE One+ instructions. This article only highlights the differences and critical parts for upgrading from C1 to C1+. For all other steps and parts, refer to the official CORE One+ manual.
What’s in your package?
Your package includes:
- Prusa CORE One kit (some parts will not be used).
- Upgrade pack for CORE One+ (contains new parts required for the upgrade).
Important: Always check the Parts list below before assembling.
Parts list: What to use and what to avoid
Nextruder
Chapter 6. Nextruder assembly
Printed parts
| Part name | Source | Use? | Image |
| Printhead-cover-right-lever | CORE One+ Printed Parts UPG | Yes | ![]() |
| Printhead-cover-right | Core XY assembly 2/2 - printed parts CORE One | No | ![]() |
Filament sensor & Spool holder
Chapter 7. Bodywork & Electronics
Printed parts
| Part name | Source | Use? | Image |
| Filament-sensor-body | CORE One+ Printed Parts UPG | Yes | ![]() |
| Filament-sensor-cover | CORE One+ Printed Parts UPG | Yes | ![]() |
| Filament-sensor-lever | CORE One+ Printed Parts UPG | Yes | ![]() |
| Filament-sensor-switch | CORE One+ Printed Parts UPG | Yes | ![]() |
| Puck-universal | CORE One+ Printed Parts UPG | Yes | ![]() |
| Filament-sensor-cover | Filament sensor & Spool holder assembly - printed parts CORE One | No | ![]() |
| Filament-sensor-body | Filament sensor & Spool holder assembly - printed parts CORE One | No | ![]() |
| Filament-sensor-lever | Filament sensor & Spool holder assembly - printed parts CORE One | No | ![]() |
| Spool-holder | Filament sensor & Spool holder assembly - printed parts CORE One | No | ![]() |
Fasteners
| Part name | Source | Use? | Image |
| M3w washer | Fasteners CORE One+ UPG | Yes | ![]() |
Top panel
Chapter 8. Trim, Door & xLCD
Printed parts
| Part name | Source | Use? | Image |
| Upg-vent-block | CORE One+ Printed Parts UPG | Yes | ![]() |
Fasteners
| Part name | Source | Use? | Image |
| M3x12rT | Fasteners CORE One+ UPG | Yes | ![]() |
Note: In the upgrade pack, you will also find a + logo sticker to place on the door according to the instructions in the CORE One+ manual. Additionally, you will find a serial number (SN) label, which must be affixed as indicated in the article Original Prusa Serial Nubmer.

Universal spoolholder
Chapter 9. Calibration & First run
Printed parts
| Part name | Source | Use? | Image |
|
Spoolholder-static (CORE One Series - spoolholder) | CORE One+ Printed Parts UPG | Yes | ![]() |
Other
| Part name | Source | Use? | Image |
| O-ring | CORE One Series - Spool Holder | Yes | ![]() |
For any further questions, refer to the official CORE One+ manual or contact our Customer support.
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