RX TOOLHEAD V5.5 using Bambu H2S/A1 gear & H2D Hotend
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Community members using the design report that it is a sleek well-engineered, aesthetically sharp, and hig performance
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Model information
- Source
- Printables
- Category
- Voron Parts & Upgrades
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
If this project has improved your printer or brought you value, please consider supporting its future on Patreon. Every contribution helps fund continued development, including the cost of new components, prototypes, and the filament used for testing and validation. Your support makes it possible to keep improving the project and bringing new features and updates to the community. Thank you! |
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Full step-by-step NEW Assembly Video
⚠If you are using the H2S extruder, don't skip this part! bellow
You’re chasing top-tier print quality without breaking the bank, this DIY Bambulab H2D/P2S style of toolhead is a game-changer. — It’s modular, efficient, and full of smart upgrades.
✅ Why Build One?
Compatible with Bambu Lab H2D, P2S, A1, P1S, and X1C hotends.
Compatible with H2S and A1 extruder gears.
Delivers exceptional print quality while remaining compatible with Bambu Studio print profiles.
Designed with continuous improvement in mind—the designer actively maintains and updates it based on real-world testing and community feedback.
Supports 6 and 9 mm belts, for default VORON SV08 and Monolith gantries
Carriage for MGN12H and MGN9MM rails mount
Modular and fun: Since the front cover is detachable, you can quickly swap it for the Pen Plotter module and turn your printer into a drawing machine. (example here )
Quick-swap nozzles — Get back to printing in seconds. Thanks to the Bambu Lab hotend heating assembly, nozzle changes require no contact with the thermistor or heater wiring, eliminating the common risk of damaging thermistor cables during swaps.
Modular design — Easily upgrade, replace, or service individual components.
Integrated filament sensor — Built-in for a clean installation and reliable filament detection.
Automatic filament loading — Smooth, convenient, and user-friendly.
Lightweight toolhead — Optimized for input shaping, high-speed printing, and precise motion.
Affordable components — Compatible clone parts are widely available, making maintenance and upgrades cost-effective.
Engineered for reliability — A robust mechanical design built for long-term performance.
Clean, professional design — Looks and performs like a refined production toolhead, not a typical DIY project.
Supports Different Probe types
Very easy to assemble and maintain
Visual Guide
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📦 Materials (BOM) – Organized by Category
All items include direct purchase hyperlinks
⚠ Note About Links & Purchasing
Some of the Amazon links are affiliate links, provided only as a reference for part specifications and compatibility.
You are not required to buy from Amazon, and I don’t mind where you purchase the parts from.
My main goal with this project is to keep it as budget-friendly as possible so more people can build, experiment, and enjoy this toolhead.
Feel free to source parts locally, from eBay, Taobao, Bambu Lab, or any trusted supplier, as long as the specifications match.
⚠Also, pay attention and don't just buy everything on the list, some are duplicated. Just choose what you need ‼
RX VORON V5–5015 Toolhead BOM
Fasteners & Hardware
Photo | Part | Store links |
|---|---|---|
 | M3 Countersunk Screws (6–30 mm) and M3 Nuts | Amazon assortment · Taobao listing (Screws only; nuts separate) |
 | M2×10 Self-Tapping Screws | |
 | M3 Brass Heat-Set Inserts (M3×5×4.5 plus 6 × M3×4×4) | Amazon reference (check size) · Amazon search · Taobao listing (Select both sizes) |
 | Ø6×3 mm Round Magnet | Amazon · Taobao listing (Confirm 6×3 mm; title shows other sizes) |
Tubing & Connectors
Photo | Part | Store links |
|---|---|---|
 | PTFE Tube + ECAS04 Connector | |
 | PG7 Cable Connector (EBB36 v1.2) | |
 | 5-Pin Straight Magnetic Pogo Connector (optional) | Amazon search · Taobao listing (Confirm straight 5-pin; title omits 5-pin) |
Cooling Fans (⚠Pay attention to the voltage according to your toolhead headboard voltage requirement)
Photo | Part | Store links |
|---|---|---|
 | 2510 Hotend Fan | |
 | 5015 Blower Fan |
Electronics & Boards
Photo | Part | Store links |
|---|---|---|
 | BIGTREETECH EBB36 v1.2 Toolhead Board | |
 | BIGTREETECH EBB36 Gen 2 Toolhead Board | |
 | NeoPixel RGB LED Strip (optional) |
Heating Assemblies (choose one)
Original Bambu Lab assemblies strongly recommended. DO NOT buy H2D Left – The Right is easier to work with.
Photo | Part | Store links |
|---|---|---|
 | Bambu Lab A1 Heating Assembly (flow about 32mm3) | |
 | Bambu Lab H2D Right Heating Assembly (recommended higher flow about 65 mm3) |
Probes (choose one)
Photo | Part | Store links |
|---|---|---|
 | BIGTREETECH Eddy Probe | |
 | BIGTREETECH MicroProbe | |
 | Cartographer Probe | |
 | Beacon Probe |
Extruder Gears (choose one)
Recommended for TPU: Bambu Lab H2S extruder gear assembly. The H2S kit includes a compression spring for the tensioner. Buy MR104ZZ bearings separately for the H2S kit or any third-party kit that comes without bearings. See the bearing links below.
Photo | Part | Store links |
|---|---|---|
 | Bambu Lab H2S Extruder Gear Assembly | |
 | Bambu Lab A1 Hardened Steel Extruder Gear Assembly | |
 | BIQU Extruder Gear Assembly | Amazon · Taobao listing (Third-party A1 option; BIQU brand unconfirmed) |
Extruder Gear Bearings
Photo | Part | Store links |
|---|---|---|
 | MR104 ZZ Bearing (H2S or gear kits without bearings) |
Springs
Photo | Part | Store links |
|---|---|---|
 | 1×5×3 mm Torsion Spring, 120° | |
 | Compression Spring (0.8 mm wire × 5 mm OD × 10 mm length) | Amazon reference (check size) · Taobao listing (Confirm 0.8 mm wire, 5 mm OD, 10 mm length) |
Pins, Blades & Switches
Photo | Part | Store links |
|---|---|---|
 | 3×20 mm Dowel Pin (optional; also can use a screw isntead) | Amazon reference (check size) · Taobao listing (Select 3×20 mm) |
 | M3×20 Screw (dowel pin alternative) | |
 | Bambu Lab A1 Filament Cutter Blade | |
 | 13×5.5 mm Limit Switch | |
 | KFC-V-105S-2-T Microswitch (dual filament sensor option) |
Hotends (match the heating assembly)
Match your hotend to your heating assembly. Mixing A1 heating assembly with H2D hotend gives almost no flow improvement.
Photo | Part | Store links |
|---|---|---|
 | Bambu Lab H2D Standard Hotend | |
 | Bambu Lab H2D High-Flow Hotend | |
 | Bambu Lab A1 Hotend |
Motors & Wiring
Photo | Part | Store links |
|---|---|---|
 | Bambu Lab P1S / X1C Extruder Motor (helical gear) | Amazon · Bambu Lab · Taobao listing (Select helical P1S / X1C) |
 | 28 AWG Stranded Wire | |
 | Servo Motor (optional) |
🟢 One-Stop: All-Original Bambu Lab Parts
Purchase directly from Bambu Lab for guaranteed compatibility:
A1 Filament Cutter Blade → Bambu Lab Store
H2S Extruder Gear Assembly (Recommended)→ Bambu Lab Store
A1 Extruder Gear Assembly (alternative)→ Bambu Lab Store
A1 Heating Assembly → Bambu Lab Store
H2D Right Heating Assembly (recommended higher flow rate)→ Bambu Lab Store
P2S Heating Assembly (almost the same as H2D) → Bambu Lab Store
H2D Normal/High-Flow Hotends → Bambu Lab Store
A1 Hotend → Bambu Lab Store
Torsion Spring 1×5×3 (120°) → Bambu Lab Store
💡 Pro Tip: Bookmark this list! Double-check compatibility before ordering, especially for heating assemblies and hotends. When in doubt, buy original Bambu Lab parts for best results. 🛠✨
If using a static filament cut depressor, to prevent the toolhead from crashing, configure an excluded zone in your slicer according to the depressor’s XY position.
⚠ After installing this toolhead, remember to update your slicer settings for retraction and deretraction speeds.
Also, don’t forget to update the extruder rotation distance and heating assembly sensor type in Klipper to the value below:
rotation_distance: 4.7979
sensor_type: Generic 3950 #Must use this for Bambulab sensor type
pullup_resistor: 4700 #for ebb36 gen2 default use 2200
min_extrude_temp: 0 #important if you will use my load unload filament macro, keep it 0
max_extrude_only_distance: 300.0 # #important if you will use my load unload macro
max_extrude_cross_section: 10.0
I have attached a .txt file below with all important Klipper settings and macros for proper use of this toolhead
💡I’ve noticed that most people tend to comment or share photos only when they run into issues. But this toolhead represents over a year of work, iteration, and improvement to become what it is today.
So I truly appreciate everyone who takes the time to share photos of their builds — not just problems, but successes too. It really means a lot and helps show what this project can achieve in the real world.
Thank you for being part of it 🙌
Enjoy the future of DIY printing!
Happy printing!
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🔧 Common Issues & Fixes
1. Extrusion Inconsistency
Possible causes & checks:
• Rotation Distance
• Make sure your rotation_distance is set correctly as specified in the provided .txt file.
• Sensor Type
• Verify that the correct sensor type is set correctly as specified in the provided .txt file.
• Filament Tensioner Adjustment
• Proper tension is critical.
• Tighten the screw without filament inserted until you see slight movement, then stop.
• Too tight → filament deformation
• Too loose → slipping / under-extrusion
• Spring Selection
• You can use different springs, but:
• If the spring is too soft, it will cause inconsistency at high flow rates.
• Recommended: ≤ 0.8 mm wire thickness
• Weak springs = unstable extrusion under speed
• Filament Sensor (Switch Type)
• If installed:
• Enable pull-up resistor in Klipper (^ symbol)
Example : switch_pin: ^EBB:PD0
• Without it:
• You may get false triggers
• This can unintentionally activate load/unload macros → causing inconsistent extrusion
2. Heating Assembly Melting mainbody mount
• If your chamber temperature exceeds 55°C and you are printing at a nozzle temp over 260c.
• Use high-temperature materials to print mainbody, such as:
• PAHT-CF
• PPS
• PA12-CF
• Alternative:
• Use the hybrid design provided on step&stl:
• Printed body + CNC/machined high-temp components
3. Filament Cutter Getting Stuck
• Do not fully tighten the screw holding the cutter.
• Leave slight clearance:
• The spring will handle the pressure.
• Over-tightening = binding/jamming
4. Filament Not Fully Clearing After Cut
• A small piece may remain inside, making hotend swaps difficult.
Solution:
• Use the provided cutting macro
• Make sure to:
•Properly tune the XY position Align it with your cutter depressor location
5. Back Cover Hitting the Carriage
• Some printer carriages are taller than standard.
Fix:
• Use the default shorter back cover version
6. Heat Affecting Probe (Eddy / Microprobe)
• Excess heat from the hotend can damage or deform your probe.
Solution:
• Print and install the probe heat shield included in the model
7. The thermistor is reading the wrong temperature
Thermistor Pull-Up Resistor Guidance🌡
Different toolhead boards may require different pull-up resistor values for accurate temperature readings. This affects how the thermistor signal is interpreted by Klipper or other firmware.
• Ebb36 1.2: Works correctly with a 4700 Ω pull-up resistor.
[pullup_resistor: 4700]
• Ebb36 Gen2 : Requires a 2200 Ω pull-up resistor for correct readings.
Tip: If the temperature readings seem offset (too high or too low), check the pull-up resistor value first before adjusting any other settings. Using the wrong pull-up resistor can cause misreading by ~30 °C or more, affecting print quality and material behavior.
pullup_resistor: 2200
💡 Final Tip
Most issues here come down to setup precision, not hardware defects.
Take your time during installation:
• Follow the documentation carefully
• Double-check mechanical adjustments
• Validate your Klipper config before printing
RX Toolhead V5.5.2 Changelog
This is a major update. I recommend reprinting all parts except the carriage.
If you are using the H2S Main Body, you do not need to reprint it. However, the A1 Main Body must be reprinted.
New Features
Added OZNLAB Sensor support
Real-time Pressure Advance reading and automatic PA insertion into the start print
Z-offset calibration with tap
Bed mesh with tap
Nozzle clog detection
And more
Added SV08 Carriage
Added dual filament sensor support for the A1 extruder gear setup
Added Pen Plotter Module 🖊
A fun mod that allows you to quickly replace the front cover with a pen plotter module
Draw on paper using your printer
OrcaSlicer profile included
🔧 Design Improvements
> Renamed the CAD files and organized them by group, making the assembly easy to understand
Redesigned front cover
RX logo moved to the top
Added a slot for an RGB NeoPixel
Fan position lowered for improved cooling
Reduced the rear electronics section by 8 mm
Improved extruder gearbox design
Improved Cartographer / Beacon / Mellow Fly sensor mounts
Improved umbilical cable holder
📦 Reprint Recommendation
Because this is a major redesign, I strongly recommend reprinting all parts except the carriage.
H2S setup: Main Body can be reused
A1 setup: Main Body needs to be reprinted
Other updated parts should be reprinted to take advantage of the latest improvements.
RX Toolhead V5.5.5 Changelog
NEW Front Cover setup for 5P Pogo pins (STL uploaded separately only. The .step file will be uploaded in the next versions
