Threaded Bulkhead Fitting for IBC Tank / Drum — 110mm Pipe Pass-Through with Bolt Backup
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Estimated printing price per file
€6.05 – €7.39 net (excluding VAT)
For file: final_cuerpo_v4_PLA_5h7m.gcode
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File used for this estimate
Average indicative estimate: €6.72 excluding VAT (range midpoint).
- Weight reported by the author
- 120 g
- Print time reported by the author
- 5 hr
- Source material
- PLA
- Estimate material
- PLA
- Estimate printer
- Bambu Lab P1S - 0.4 nozzle
- Estimate process
- 0.20mm Standard
Indicative estimate for the selected file only, based on the author’s weight and print time. File variants are not added together. The final price is calculated after file analysis.
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Threaded bulkhead fitting for passing 110mm pipe through the wall of an IBC tank. Seals with a compressed rubber gasket,
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Updated at source:
Model information
- Source
- Printables
- Category
- Other House Equipment
- License
- Creative Commons — Public Domain
Threaded bulkhead fitting for 110mm pipe, designed for DIY wastewater treatment setups (an eco septic system using IBC totes, but works for anypass-through on a flat-walled plastic tank).
Will upload more pictures asap.
TWO PARTS: a body with a flange and male thread, and a nut with a female thread that tightens from the other side of the wall, compressing a hand-cut rubber gasket (from an old inner tube) between both faces.
FEATURES:
- Coarse-pitch trapezoidal thread (6mm pitch), specifically designed to print cleanly on FDM without needing tight tolerances
- 6 backup M6 bolt holes, positioned inside the same band as the gasket — can be used with the thread alone, bolts alone, or both together for extra firmness
- Includes the parametric .scad file (OpenSCAD) so you can adjust pipe diameter, thread pitch, clearances, etc. to your own case
MATERIAL: print in PETG for the final installation (PLA won't hold up to permanent moisture). PLA is perfectly fine for a fit test before committing to the full piece — I recommend printing just a couple of thread turns first (see note in the .scad) to confirm it fits your printer before printing the full part.
RECOMMENDED PRINT SETTINGS:
- 0.4mm nozzle (with a 1mm+ nozzle the thread doesn't come out well defined)
- Wall loops: 4 minimum (with 2, the thread tooth comes out hollow inside and loses firmness)
- Infill: 40% or more
- Fan at 100%, enable "small feature speed" or reduce speed on small perimeters, and raise "minimum layer time" to 8-10s — without this, the thread ridges can come out stringy/drooping from insufficient cooling between layers
- No supports needed (you'll get overhang warnings for the grip notches and bolt-head recesses — safe to ignore)
- If your slicer's estimated time jumps to over a day with most of it being "travel," check your short-distance travel acceleration setting, and if it's still off, close and reopen the slicer before suspecting the model
ASSEMBLY:
1. Drill the central hole in the tank wall (diameter slightly larger than the thread's major diameter)
2. Cut a gasket (car inner tube) matching the gasket recess diameter, with holes for the pipe in the center and the 6 bolt positions
3. Pass the body through from inside the tank, thread the nut on from outside
4. If using the backup bolts, add standard M6 nuts and washers The whole design process was iterative — this file went through several test versions before landing here, so the clearance values are already tuned for printing on an Ender 3 V3 SE with a 0.4mm nozzle. If you print it on a different printer and it comes out too tight or too loose, the .scad has the clearance parameters commented for adjustment.