BD Pressure- Realtime PA Adjustment

ressure Advance (PA) is one of the most impactful tuning parameters in FDM printing, yet calibrating it correctly is time-consuming, requires print-specific expertise, and must be repeated whenever filament, speed, or temperature changes.

bd_pressure solves this with a dedicated strain-gauge sensor module that measures extruder pressure directly — without printing a single line. It runs an automated calibration routine by simulating extrusion pressure behaviour during acceleration and deceleration, then reports the optimal PA value to the printer firmware over USB or I2C.

The same hardware doubles as a high-precision nozzle probe for bed levelling, acting as a drop-in switch-type endstop on the Z− pin.

designed to be used in E3d V6, dragon and hot ends with similar mounting systems. 

Feature:

• Automated Pressure Advanced Calibration
• Nozzle Probe

• Small and strong: only 6 mm in height, 2mm thick steel

• Integrated MCU and High speed ADC, No external PCB board required.

• Small and supper soft cable
  

• Connects directly to your toolhead board or Pi via I2C or USB.

Hotend info:

• V6 style mounting options
• 24v 60W ceramic heater 
• 23 mm^3 of flow
  

Different Modes:

1. PA Mode:

    Automated Pressure Advanced Calibration.

    Without printing calibration lines, it just simulate extrusion pressure behavior during acceleration and deceleration while only the extruder is working.

    This work process is similar to the Bambu Lab A1 printer, instead, we use  strain gauge, not eddy sensor.

2.  Probe Mode: 

     Use the strain gauge to sense the nozzle pressure while probing .

     It works as a normal switch endstop sensor, so we can just power it and connect the  Z- pin to the mainboard. 
 

Package list:

• 1 * bd pressureE sensor
• 1 * USB cable
• 1 *  Hotend (Option)

More info

• BDpressure | Wiki
• GitHub: markniu/bd_pressure
• Discord:  3D Printscape
• Video:  youtube