Promethium Line · Modular Pipeline Blockade, 14 Segments with Vehicle Crossing · 28–32 mm Grimdark Wargaming Terrain

### The barrier line

The pipeline is the backbone of the Promethium Line: one connected barrier line of 14 segments that carries promethium across the battlefield. Tall blockade sections with twin pipes and red collector links, headers down to a ground line, a pressure burst and a torn-off line over a black pool, a riser up to pipe bridge A and buffer tank B, and a loading branch for the tanker wreck C. H14 is the vehicle crossing: the pipes dip under an armoured drive-over deck with a ramp on each side, and it is the one gate tanks can use through the blockade.

### Features

- 14 segments, 29 identical series flanges: every flange fits every flange, either way round (407 pairings checked digitally)
- Ground line at 28.0 mm on every segment. The riser H12 climbs to 89.2 mm for A and B. The branch H13 has a side port that docks tanker C.
- Blockade top 72.2 mm, above 2″
- H04 stair crossing: stairs over the blockade to a 3″ platform, 50.8 mm clear on stairs and platform, one 40 mm base stands on the platform
- H14 vehicle crossing: 208 mm clear lane across 431.8 mm, 15.3° ramps, deck at 47.0 mm, highest point 49.97 mm (below 2″). A large tank hull of 160 × 180 × 108 mm plus hand room fits on the deck and both ramps. Four armoured parapets stand beside the lane.
- Footprints: 6″ × 2″ and 10″ × 2.5″ plates, H04 a 6″ × 2″ core with two 10″ × 2.5″ stair arms, H14 a 12″ × 4″ core with two 12″ × 6.5″ ramp plates. Total area 2,812.9 cm².
- Plates longer than 220 mm are split in the middle and keyed with tenons
- Loose rules card for the whole set

The 14 segments (category · footprint · print time · PETG):

- H01 Blockade straight 1 · Dense · 6″ × 2″ · 9 h 39 min · 119.1 g
- H02 Blockade straight 2 · Dense · 6″ × 2″ · 9 h 39 min · 119.1 g
- H03 Blockade bend · Dense · 10″ × 2.5″ · 15 h 45 min · 198.5 g
- H04 Stair crossing · Dense · 6″ × 2″ + 2 × 10″ × 2.5″ · 31 h 12 min · 375.8 g
- H05 Header, transition 1 · Dense · 6″ × 2″ · 8 h 07 min · 100.4 g
- H06 Header, transition 2 · Dense · 6″ × 2″ · 8 h 06 min · 100.4 g
- H07 Ground line straight 1 · Light · 6″ × 2″ · 6 h 09 min · 77.3 g
- H08 Ground line straight 2 · Light · 6″ × 2″ · 6 h 09 min · 77.3 g
- H09 Ground line bend · Light · 10″ × 2.5″ · 9 h 58 min · 127.1 g
- H10 Ground line, pressure burst · Light · 6″ × 2″ · 5 h 55 min · 71.0 g
- H11 Ground line, torn off · Light · 6″ × 2″ · 5 h 53 min · 71.0 g
- H12 Riser, port for A/B · Light · 6″ × 2″ · 6 h 56 min · 86.5 g
- H13 Loading branch, port for C · Light · 6″ × 2″ · 7 h 02 min · 86.9 g
- H14 Vehicle crossing · Exposed, objective · 12″ × 4″ + 2 × 12″ × 6.5″ · 90 h 24 min · 1,049.7 g

### Game use

Rules for Warhammer 40,000, 11th edition. Unofficial fan-made terrain. Not affiliated with or endorsed by Games Workshop. Warhammer 40,000 is a trademark of Games Workshop Ltd.

- Categories (suggested, agree before the game): H01–H06 blockade Dense, H07–H13 Light, H14 Exposed.
- Fixed agreement for the blockade: VEHICLE and MONSTER models without FLY can neither cross H01–H06 nor end a move on it.
- H14 is the exception: nothing on it is higher than 2″, so all models can cross it and end a move on it, and the blockade rule does not apply. INFANTRY, BEASTS and SWARM on H14 still get the Benefit of Cover, but it is not obscuring and does not allow Hidden.
- Levels: 3″ platform on H04, for INFANTRY, BEASTS, SWARM and FLY, one 40 mm base. The stairs are a route, not a standing surface.
- Objective piece: H14 only, its whole terrain area of three plates.
- Terrain areas: each base plate is one terrain area. H04 and H14 each cover their three touching plates.
- Terrain action: none anywhere on H. The oil pools are paint only.
- Set-up idea: close the blockade into one line across the table and set H14 into it as the only vehicle gate. Infantry crosses at the H04 stairs or climbs over. Without H14, leave vehicle-wide gaps.

### Print settings

- PETG, 0.4 mm nozzle, 0.2 mm layers
- 3 perimeters, 4 bottom / 5 top layers, 15 % gyroid, 240 °C nozzle / 80 °C bed (follow your filament maker's values)
- No supports, no automatic supports, no brim. Every plate fits a 220 × 220 mm bed and all parts are already oriented.
- The full set is 234 parts on 26 segment plates (01A to 14G), a pin kit plate KA and a test plate TA. Each segment plate belongs to one segment, so you can print only the segments you want.
- KA holds 19 loose network pins: 13 for the pipeline network, 2 for A and C, 4 spares.
- TA holds two complete test flanges and one pin. Print it first.

Print time and filament (PrusaSlicer 2.9.6 estimate, heat-up not included):

- Per segment: see the segment list above
- KA · Loose network pins: 0 h 43 min · 6.0 g
- TA · Test flanges, print first: 1 h 21 min · 16.3 g
- Whole set including KA: 221 h 37 min · 2,666.0 g (with TA: 222 h 58 min · 2,682.3 g)

Start small: H01–H07, H09, H12 and H13 (ten segments) give both blockade straights, the blockade bend, the stair crossing, both headers, a ground straight, the ground bend, the riser and the branch for C. For the three-central-objectives set-up, print H01–H08, H13 and H14 instead.

### What else you need

- 58 magnets, 5 × 2 mm discs, for all 29 flanges (plus 4 for the test flanges). Each flange takes 2.
- 44 filament dowels, 1.75 mm × 7.6 mm, for the pipe half shells
- PETG-safe glue. The 34 internal square pins are printed in the segment plates.

### Assembly highlights

- Print TA first and try the 5 mm pin in the 5.40 mm socket and the magnets in their pockets by hand.
- Pipes print as half shells. An even file number and the next odd number belong together. Dowel and glue them flat.
- Glue the flanges onto the pipe ends with the notch up and the faces exactly flush with the plate edges.
- Magnet polarity, the same on every flange of the set: look at the flange face with the notch at the top. Left magnet north pole out, right magnet south pole out. Mirrored faces then always meet north against south. Compare with an existing flange before gluing.
- H14: two ramp plates glue to the core plate, four ramp strips form the ramps, and the deck sits on top at 47.0 mm, flush with the ramp crests.
- Step-by-step instructions, saddle positions and all parts are in BUILD_GUIDE_H.pdf.

### Works with the rest of the set

Promethium Line is a coherent terrain set in ten modules with one story. The mountain is the promethium source, drill station D taps it, and the pipeline H carries it past pipe bridge A and buffer tank B to the refinery with tower E and the bombed tower turned drill rig F. Loading yard G closes the chain. Craters K, the tanker wreck C and field defences J show the fight for it.

Every pipe flange in the set fits every other flange: Ø 44 mm, a square system pin and two 5 × 2 mm magnets. H runs on the 28.0 mm ground line with G and C. The riser H12 links it to the 89.2 mm high line of A, B, D, E and F. The vehicle crossing H14, drill station D and refinery tower E make the three-central-objectives set-up described in the collection. See the Promethium Line collection for all modules.

### Files

- Model files: all STLs in print orientation, plus one PrusaSlicer 3MF project per print plate, named job_<plate>_….3mf (01A to 14G, KA, TA). The STLs are shared series parts, for example flange.stl is used 31 times, so print from the 3MF plates. There is no G-code. Slice the 3MF projects with your own printer profile.
- Other files:
- rules_card_H.pdf: one loose rules card for the whole pipeline, 85 × 54 mm
- TABLE_RULES_card.pdf: one card for the whole table (Core Rules reminder, objectives, terrain actions), two sides
- BUILD_GUIDE_H.pdf: segment list, parts list, plates, saddle positions and step-by-step assembly
- RULES.pdf: all set rules in full, with Core Rules references and the balance maths
- source_H.zip: the parametric source code, to change tolerances and rebuild every STL
- Print all cards at 100 % (no page scaling). The Table Rules card has two pages: cut them out and glue them back to back.

### How it was made

Designed with AI assistance as parametric Python CAD code (build123d / manifold3d) and checked by automated tests: watertight meshes, overhangs of at most 45°, bridge lengths, collision checks, the any-to-any flange matrix, the 2″ height limit and the tank lane of H14, and a PrusaSlicer run for every plate. It has not been test-printed yet. The fits are designed, not proven on a real printer, so print the test flanges first. Makes and feedback are very welcome.