FarmLoop Stage 2 assembly, Bambu P2S

Please read through the entire guide before beginning the installation. Ensure you have all prerequisites ready to avoid interruptions during assembly.

This guide covers the Bambu Lab P2S. Assembly is nearly identical to the P1P, P1S, and X1C guide, the P2S uses smaller M2 screws for the door hinge bracket, a 4-pin-to-6-pin Molex cable instead of the Y-cable on older kits, and has no cooling-fan module to install.

Approximate time: 45-60 minutes.

Prerequisites

• Bambu Lab P2S with latest firmware installed
• Printed parts from Makerworld - FarmLoop Stage 2 for P2S
• FarmLoop Pro App subscription, sign up at app.3d-farmers.com - not required if you already have a SimplyPrint Print Farm subscription (see SimplyPrint integration)
• A clean, flat work surface with enough space to lay out all components
• ~45-60 minutes for complete installation

Printed-part versions may vary

The 3D-printed parts have gone through minor revisions over time and may look slightly different (color, small shape tweaks) from the photos in this guide. Installation is identical regardless of version.

Before you start

• Power off and unplug the printer. The system draws power from the AMS port; if you’re keeping the AMS connected, use the included Molex cable for safe power distribution.
• During operation, never reach into the printer while the bender is active - the actuator exerts 64 N of force.
• Before installing the bender, make sure the build plate is raised above the bender position (remove it first if it’s below).
• Parts are designed to fit smoothly - if a component needs excessive force, stop and check orientation.
• Route all cables away from moving parts; loose cables can foul the Z-axis lead screws, the toolhead, or the build plate.

Check that all parts are present

Before starting, lay out every part from the kit and verify you have them all.

New kits ship with a power supply instead of the AMS cable

Since August 2026, new A, P and X series kits include an external power supply and no longer include the 4-pin-to-6-pin power cable. If your box has a power supply and no AMS power cable, nothing is missing - the power supply replaces it, and FarmLoop runs independently of the printer’s AMS port. See the power supply article for why. The AMS wiring steps below apply to older kits.

3D-printed parts (orange pieces)

Hardware

• FarmLoop actuators (50 mm & 125 mm)
• ESP32 controller board
• Door-opener button & cables
• Limit switch
• Wiring harness
• Molex cables
• 4-pin-to-6-pin cable - older kits only, see the note below
• External power supply - new kits, replaces the AMS power cabling above
• Stock rubber damper feet
• Double-sided white tape strips
• Black textured tape strips
• Cable ties & wire cutter

Screws & nuts

• M2 × 8 mm (2 pcs)
• M3 × 20 mm (1 pc)
• M4 × 16 mm (1 pc)
• M4 × 20 mm (1 pc)
• M3 hex nut (1 pc)
• M4 hex nut (2 pcs)

1. Assemble the door opener

1. Push the O-ring over the button until it sits in the recess. Insert the button through the hole in the orange bracket from the top.

2. Secure it underneath with the hex nut.

Tip

Hand-tighten the nut only.

3. Flip the bracket over to verify the button sits flush. The hex nut should be tight, and the O-ring should provide a seal. Connect the cable to the door-opener button.

4. Press the rubber damper feet into the blind holes. These are the original rubber feet from your Bambu printer - unscrew them from the printer’s base and reuse them here. They provide vibration dampening and ensure a secure grip on the table. The rubber feet should press-fit snugly. Make sure they are fully seated in the recesses.

5. Install the door actuator and the cover containing the door button into the left tilted foot (marked L). Mount the feet on the printer.

2. Assemble the bender and attach the door hinge bracket

1. Insert the limit switch. Make sure the limit switch sits embedded like in the picture.

2. Route the cables of the limit switch through the bender holder as shown in the pictures.

Caution

The actuator is fixed inside the holder using a press-fit. A bit of force is required to fully insert it. Do not use excessive force.

3. Insert the Bender actuator.

4. Attach the bender hook using the M4 × 16 mm screw and M4 nut.

5. Finished assembly should look like this.

Caution

Double-check all cables before proceeding. Loose cables can cause malfunction.

6. Remove the two screws on the bottom hinge of the front door.

7. Attach the front hinge bracket to the printer using the M2 × 8 mm screws.

8. Position the lid arm onto the front bracket. Secure with the M3 × 20 mm bolt and insert the quick-release pin through the left hole.

9. Attach the actuator to the door bracket with the M4 × 20 mm screw. Do not over-tighten the screw. The joint should still be movable.

3. Install the bender on the printer

Remove the build plate first

If the build plate is anywhere below where the bender will sit, take it out of the printer completely before you start - don’t just slide it out of the way. There isn’t room to maneuver it back out once the bender is mounted.

1. Remove the lowest screw on the right side of the printer where the bender will be mounted.

2. Apply the included white double-sided tape strips to the front edge of the printer frame.

3. Insert the bender module. Ensure it does not interfere with Z-axis lead screws or build-plate movement.

4. Reinsert the screw behind the bender.

4. Install the PCB

1. Remove the marked screw.

2. Place the PCB basket as shown and use the same screw to mount it to the printer.

3. Assemble and lay the frame on top of the printer.

4. Connect the cables to the bending assembly.

5. Pull the cable through the opening and route it through the printer as shown. Secure the cables with tape and cable ties.

5. Cable management and PCB wiring

Older kits ship FarmBoard V2.1, current kits ship V3.1

Older P2S kits included the FarmBoard V2.1, current kits ship the FarmBoard V3.1 shown above. Both are correct and fully supported - connect cables by the port label, not by how the board looks, and ignore any port this guide doesn’t call for.

1. Connect the cables to the PCB.

2. Connect the power:
   • New kits (with external power supply): connect the power supply to the PCB and plug it into a wall socket. The printer’s AMS port is not used at all - skip the AMS cable steps below and leave your AMS wiring untouched.
   • Older kits: use the 6-pin-to-4-pin Molex cable to connect the printer and circuit board.

Cable orientation matters

Multiple systems will be damaged if cables are connected incorrectly. Make sure the notch (red circle in the diagram) aligns with the hook. Keep the printer powered off when connecting any cables.

6. Final assembly

1. Hook the scraper in at the back, then pull the front down over the print head.

2. Insert the top glass into the frame.

Operation

Door-button controls

The DOOR BUTTON is the manual-control button on the automatic door console. Its function depends on the current system state:

System state	Action	Result
Idle	Short tap	Door control (open/close toggle)
Idle	Long press (3+ seconds)	Enter test mode
Any state	5 quick taps within 3 seconds	Enter OTA configuration mode
Reset after safety-check failed	Single tap	Recovers from SAFETY_FAILED state. Homes bender, closes door, returns to initial state.

OTA mode (firmware updates + trigger-mode setup)

OTA is how you flash new firmware and how you wire up the Digital trigger mode (printer IP + LAN access code). The full walkthrough - entering OTA mode, accessing http://farmloop.local, uploading a .bin file - lives on the Accessing the board (OTA mode). Trigger-mode setup is on the Trigger mode page.

LED signals

After the board boots, the LED shows a sequence indicating connection status.

Successful startup sequence: 3 quick blinks → 5 slow blinks → 10 fast blinks. If you see all three patterns, the board is fully connected to the printer.

During OTA mode: the LED blinks rapidly at 4 Hz continuously until you exit or the timeout is reached.

LED pattern	Meaning	Action needed
3 quick blinks	Boot successful	None, normal
5 slow blinks	Wi-Fi connected	None, good
10 fast blinks	MQTT printer connected	None, fully operational
2 long blinks	Wi-Fi connection failed	Check SSID and password in OTA
4 long blinks	MQTT connection failed	Check printer IP and access code

Support

Stuck? Reach out:

• Contact: Open a support ticket
• Skool community: skool.com/3dfarmers
• Community (Pro members): log in at app.3d-farmers.com to access the Discord invitation