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Sourdough Core One

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Koco

@KoCo_367448

Use your Core One to keep your sourdough warm.

Rating: 5 / 5
Likes: 3
Downloads: 12
Makes: 0
Views: 370
Reviews: 1

Updated at source: Feb 6, 2026

Model information

Source: Printables
Category: Kitchen
License: Creative Commons — Public Domain

Details Files (1)Makes & comments (Makes: 0) (Comments: 1)Remixes (0)Collections (12)

Prusa CORE One – Sourdough Proof Box (25 °C / 12 h)

This G-code configures a Prusa CORE One as a controlled proofing chamber for sourdough and other long fermentations.

It is designed to hold the printer enclosure at approximately 25 °C for 12 hours, while ensuring the heated bed does not exceed 25 °C and the nozzle heater remains disabled.

What this G-code does

Homes the Z-axis and moves the bed to the lowest Z position
Disables the hotend heater
Sets the heated bed to 25 °C
Sets the chamber temperature target to 25 °C
Waits for the bed to reach temperature before starting the timer
Holds the environment for 12 hours
Automatically shuts down bed heating, chamber control, fans, and motors

Recommended usage

Place dough on a rack, tray, or wooden board
Do not place dough directly on the heated bed (like I did ;) )
Cover dough to prevent drying during long fermentation

Customization

You may safely edit the following values in the G-code:

Proof duration: G4 S43200 (time in seconds)
Bed temperature: M140 S25
Chamber temperature: M141 S25

Printer compatibility

Prusa CORE One
Not tested on other printers

Disclaimer / Food safety warning

This G-code repurposes a 3D printer, which is not a food-safe appliance.
The printer enclosure, build plate, and internal components are not designed for food contact and may contain residues from plastics, adhesives, lubricants, or other contaminants.

Use this G-code at your own risk.
Ensure that dough is fully covered and isolated from printer surfaces at all times.
Always monitor temperatures during the first run to confirm safe and expected behavior

; ================================
; CORE One - Sourdough Proof Box
; Target chamber: 20C
; Bed must stay <= 25C
; Hold time: 12 hours
; ================================; Safety: don't heat nozzle (leave it off)
M104 S0
; --- Home Z to know where we are ---
G28 Z                ; Home Z axis only
; --- Move bed to lowest position ---
G1 Z300 F600         ; Ensure bed is fully lowered (clamped to Z max)
; --- Set temps ---
M140 S24             ; set bed to 24C (safe margin below 25C)
M141 S24             ; set chamber target to 20C
; --- Wait to reach temps ---
M190 S24             ; wait for bed to reach 24C
; ================================
; Hold temperature for 12 hours
; 72 x 10 minutes (600 seconds)
; ================================
G4 S600
M105
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; ================================
; Cool down / turn off
; ================================
M141 S0              ; chamber control off
M140 S0              ; bed off
; --- Fans off (if any were running) ---
M107
; --- End ---
M84
; ================================