CN3D Docs/Projects/NebulaTor/Assembly
Public project reveal

NebulaTor

A CN3D-designed upgrade for the BIQU/BTT Nebula Extruder, developed around improved filament handling, sensing, serviceability, and an integrated cutter system.

Files coming soon: documentation is public now, STL files are planned next, and CAD/STEP files will follow only after final validation.

Public documentation liveBIQU / BTT Nebula ExtruderSTL coming soonCAD after validation
Explore documentationWatch in action
Angled NebulaTor render showing the front window, idler lever, spring preload mechanism, and motor side.
Docs livePublic project reveal and documentation
STL nextPrintable files planned after validation
CAD laterCAD/STEP planned after final validation
KlipperDevelopment firmware logic documented

Assembly Preview

This page follows the verified sequence in the current project manual. It is useful for understanding the build flow, but the fully validated assembly guide will accompany the STL release.

Blade handling, final fastener callouts, and current-image freshness still need final validation. Do not use this page as a final release manual.
Exploded NebulaTor assembly showing body, lever, gears, PCB, motor, front cover, inserts, and fasteners.
Exploded assembly view for system context. Final fastener details remain subject to validation.

Preparation

  • Print parts in a suitable material such as ABS, ASA, or PETG. ABS is the recommended final project material.
  • Heat-set the documented brass inserts.
  • Deburr the filament path and PTFE bores.
  • Confirm smooth filament feed before final tightening.

Assembly sequence

0

Prepare inserts and filament path

Install heat-set inserts, clean the filament path, and prepare inlet and outlet PTFE areas.

1

Install PTFE path

Insert the top inlet PTFE and short outlet PTFE, then secure the inlet collet with the blue C-clip.

2

Assemble the idler lever

Assemble the lever pivot, spring, and tensioner knob, then attach the lever to the body and verify smooth travel.

3

Install the drive train

Install hobbed gears on their shafts, align the hobs with the filament plane, and verify smooth rotation.

4

Mount motor and gear stage

Mount the motor and gearbox, mesh gears without binding, and tighten screws evenly.

5

Join the main body

Mate the motor plate and main body, tighten screws diagonally, and rotate the motor shaft by hand to confirm smooth motion.

6

Fit front cover and window

Install the accent ring and window, then attach the front cover.

7

Set spring preload

Insert filament and tighten the tensioner until filament does not slip. The manual suggests starting around one to two preload turns.

8

Electrical and motion checks

Connect motor and sensors, test manual filament feed, and run a slow extrude test.

9

Firmware calibration

Verify rotation distance and steps/mm, then tune Pressure Advance or Linear Advance for the user firmware environment.

Final Mechanical Checks

  • No rough movement through the filament path.
  • No gear binding when rotating by hand.
  • No slipping after initial spring preload.
  • No grinding marks from excessive preload.
  • Sensors and switches respond before printing.