Promethium Line · Drill Station Objective with 45° Drill Arm · 28–32 mm Grimdark Wargaming Terrain

### The source of the supply chain

D-04 is the drill station where the promethium comes out of the mountain, and one of the set's three large objectives. It stands free in front of the mountain on your table: an armoured drill arm starts high above the gallery and dips into the rock at 45°. A semicircular gallery wraps round the drill carriage, and a control deck with a red console sits above the right wing. The drill rod slides down under its own weight until the crown rests on the rock, so it meets almost any flank without cutting into your mountain.

### Features

- Footprint 330.2 × 213.7 mm: a 13″ semicircle plus a 48.6 mm connection strip. Terrain area 588.6 cm², the two sand plates.
- Gallery at 76.2 mm = 3″, control deck at 152.4 mm = 6″
- 4 checked 40 mm standing positions on both levels, clear standing width at least 46.4 mm
- Two ladders, 51.2 mm clear with 8 mm rung pitch. A 50 × 50 mm passage runs under the front left gallery.
- 18 mm railings with 24 mm armoured parapets, vision slits and rivets
- 45° drill arm with 43 mm free feed and a loose rock collar that hides the steel-to-rock transition
- 4 loose scree pieces (three wedges, one boulder) close the gap to the mountain foot
- System flange Ø 44 mm at 89.2 mm, flush with the left plate edge, connects to pipe bridge A
- Two 18 mm markers R for the terrain action SECURE, loose rules card

### 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.

- Category: Dense (suggested, agree before the game). Drill carriage, trestles, manifold and control stand block sight. The open galleries sit above them.
- Levels: 3″ gallery, 6″ control deck.
- Objective piece: yes. On a mission objective point, the whole base plate including both levels is the terrain objective. The mountain, the scree and the drill arm beyond the plate edge are not part of it.
- Terrain actions: at the start of your Shooting phase, one unit with a model on the gallery or the control deck can give up its shooting and charge for the turn to pick one:
- LOCATE: pick one enemy unit in this D. Until the end of the phase, it cannot be Hidden.
- SECURE: pick one friendly unit in this D and put marker R by it. Until the end of the next turn, you may re-roll one save roll for that unit. Remove R once it is used, or once no model of the unit is in this D.
- Set-wide frame: terrain actions are optional. Each player can start 1 terrain action per battle round, across all modules and copies. Effects do not stack.
- The mountain is not part of D. Agree its own category and terrain area before the game.

### 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, fan 30–50 %, bridge fan 100 %
- No supports, no brim. Every part fits a 220 × 220 mm bed and is already in print orientation.
- 62 module parts on 7 plates (A–G), plus the flange coupon (plate T)

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

- T · Flange coupon, print first: 0 h 28 min · 4 g
- A · Left sand plate, 5 railings, 3 gallery splices: 6 h 37 min · 87 g
- B · Right sand plate, 2 railings, drill crown, handwheel: 6 h 25 min · 84 g
- C · Gallery segment, both carriage cheeks, boulder: 6 h 05 min · 76 g
- D · Drill housing, 2 gallery segments, upper ladder, large scree, supports: 13 h 04 min · 161 g
- E · Gallery segment, 4 trestles, railings, scree, markers R, small parts: 7 h 12 min · 83 g
- F · Control deck, lower ladder, 5 railings, drill drive and rod, rock collar, pipe inlet, objective sign: 11 h 28 min · 136 g
- G · End cap D-04: 0 h 29 min · 6 g
- Total module: 51 h 19 min · 634 g (with coupon: 51 h 47 min · 638 g)

### What else you need

- 2 magnets, 5 × 2 mm discs (plus 4 if you fit them in the coupon)
- Model glue suitable for PETG. No screws needed.
- If your mission uses single objective markers, flat 40 mm discs (not included). Markers R are for SECURE only.

### Assembly highlights

- Print the coupon first and check the system pin and magnet fit on your own PETG.
- The two sand plates join with three small plate connectors. Four radial trestles carry the four gallery segments, and three flat splices sit under the joints.
- The drill housing sits between two carriage cheeks with large glue faces. Thread the rock collar and crown onto the rod, add the stop ring and the drive. The rod stays loose for its 43 mm feed.
- 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. Test against pipe bridge A before gluing.
- Set-up at the mountain: on flanks of about 40–60°, push the plate right up to the foot. On steep walls, leave 40–60 mm and fill the gap with the scree wedges. On flanks shallower than 40°, put the boulder under the crown.
- Step-by-step instructions, the full reach table and all parts are in BUILD_GUIDE_D.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. D sits on the 89.2 mm high line: pipe bridge A plugs straight in, and the riser H12 links it to the pipeline's ground line. D, refinery tower E and the vehicle crossing H14 make the three-central-objectives set-up described in the collection. See the Promethium Line collection for all modules.

### Files

- Model files: all single STLs in print orientation, plus one PrusaSlicer 3MF project per print plate, named job_<plate>_….3mf (T, A–G). There is no G-code. Slice the 3MF projects with your own printer profile.
- Other files:
- rules_card_D.pdf: the module's rules card, 85 × 54 mm, a loose card
- TABLE_RULES_card.pdf: one card for the whole table (Core Rules reminder, objectives, terrain actions), two sides
- BUILD_GUIDE_D.pdf: parts list, plates, reach table, magnet polarity and step-by-step assembly
- RULES.pdf: all set rules in full, with Core Rules references and the balance maths
- source_D.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 of the full assembly, standing tests, the drill reach on flat flanks from 40° to 90° and a PrusaSlicer run for every plate. It has not been test-printed yet. The fits, the rod sliding and the fit against a real mountain are designed, not proven, so print the flange coupon first. Makes and feedback are very welcome.