The mk3s prusalink rpi camera holder by david is a popular free download designed for makers using Raspberry Pi cameras on MK3 3D printers. This open source bracket helps you position and mount a standard Raspberry Pi camera for precise filament sensing and closed loop printing.
Because the file is available as a free stl model, it is easy to customize, share, and integrate into existing toolchains. Below you will find a detailed overview, specification table, setup guidance, and answers to common questions about this accessory.
| Feature | Specification | Benefit | Compatibility |
|---|---|---|---|
| Designed for | Prusa MK3 / MK3S | Fits factory frame profiles | MK3, MK3S |
| Camera type | Raspberry Pi Camera Module v2 | Common, affordable, documented | Pi NoIR, standard Pi cam |
| Mounting style | Side bracket with screw clamp | Secure, adjustable position | Adds minimal height |
| Connectivity | Flexible wire or direct Pi Zero connection | Supports remote placement, longer cable runs | Can use Prusa MK3S connectors |
| License | Open source free download | No royalties, modifiable | Attribution appreciated |
Hardware Setup and Positioning for Filament Sensing
Mounting the Bracket on the MK3s Frame
Install the mk3s prusalink rpi camera holder by david on the left side of the MK3s frame using the built in slots and screws. Aim for a stable, vibration free location that keeps the Raspberry Pi camera parallel to the extruder carriage movement path.
Optimizing Camera Angle for Consistent Filament Detection
Adjust the holder height so the lens sees a clear side view of the filament between the idler and the hotend. Fine tilt and rotation in small steps to reduce false triggers and improve sensor reliability during prints.
Preparing the Raspberry Pi for Prusa Integration
Flashing the Correct Operating System Image
Use the PrusaLink or a compatible Raspberry Pi OS image and write it to an SD card with Raspberry Pi Imager or balenaEtcher. Enable camera interface and SSH during initial setup to simplify later configuration.
Connecting the Camera Cable and Testing
Attach the flex cable carefully to the Raspberry Pi camera connector, avoiding sharp bends. Run a quick test print while streaming the preview to confirm the lens is in focus and the field of view covers the full filament span.
Calibration and Slicer Configuration
Measuring Effective Offset from Extruder
Record the distance from the camera lens plane to the extruder nozzle in your slicer as a filament sensor offset. This value is crucial for proper slicing with PrusaSlicer and for closed loop filament width sensor workflows.
Enabling Closed Loop and Setting Sensor Parameters
Activate closed loop mode in the advanced settings, then enter the measured offset, pixels per millimeter, and threshold values derived from your test prints. Save these settings into a printer profile for repeatable results.
Troubleshooting and Reliability Tips
Reducing Vibration and Improving Mount Stability
Use rubber washers or damping pads between the holder and the frame, especially on machines located near doorways or heavy workbenches. Check screws periodically, because loosened mounts can cause drift and filament detection failures.
Managing Cables and Avoiding Interference
Route the ribbon cable along existing guides and secure with adhesive clips to prevent snagging. Keep high current wiring away from the camera flex cable to minimize electrical noise that could corrupt frame captures during long prints.
Recommended Practices and Next Steps
- Print the holder with a mechanically strong material and at least 3 perimeters for frame durability
- Verify camera alignment with dry runs before starting long overnight prints
- Log your offset and slicing settings in a custom profile for quick reuse
- Keep the flex cable slack enough to accommodate carriage travel without tension
- Periodically inspect the mount for cracks or stress marks, especially on high frequency printers
FAQ
Reader questions
Can I use the mk3s prusalink rpi camera holder by david on MK2.5S or other printers?
The stl is tailored for Prusa MK3 and MK3S profiles, so fit on older MK2.5S may require frame modifications or alternative mounting brackets.
Which Raspberry Pi camera module versions are officially recommended?
The holder is designed for the standard Raspberry Pi Camera Module v2, and many users also report success with the NoIR variant using the same connector.
How do I calculate the correct filament sensor offset after mounting?
Measure the distance from the center of the lens to the point where the filament crosses the idler, then enter this value as the sensor offset in PrusaSlicer advanced settings.
Does using this camera holder affect warranty or official Prusa support?
Because the part is unmodified official hardware, attaching user provided brackets does not void warranty, but any damage caused by incorrect installation is user responsibility.