Simultaneous 8-Channel Shot Loader (ZADOK 8KU) — Enhanced Version
Printable using 0.4 mm or 0.6 mm nozzles.
For parts 1 and 2: set perimeters and infill according to your preference.
For parts 3 and 4: use 5–6 perimeters and 95% rectilinear infill.
Assembly requires DIN 965 countersunk screws:
8 pcs of M3x30 and 1 pc of M3x16.
ЗАДОК 8КУ — Full Technical Specification
Simultaneous 8‑Channel Shot‑Pellet Loader (Improved Version)
Russian name: Заряжайка Дроби Одновременная Канальная, 8‑канальная улучшенная
Purpose: High‑throughput, consistent‑weight dispensing of lead shot into 8 shotgun hulls at once.
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1. Functional Overview
The ЗАДОК 8КУ is a mechanical volumetric dispenser designed to:
– Hold a bulk quantity of lead shot (typically #5–#9).
– Meter eight identical charges simultaneously.
– Drop those charges into eight hulls positioned under the channels.
– Maintain consistent pellet mass across all channels.
– Increase throughput for reloaders who load dozens or hundreds of shells per session.
It is a gravity‑fed, manual‑actuation device with no springs, electronics, or pressure‑based metering.
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2. Core Capabilities
2.1 Simultaneous 8‑Channel Dispensing
– Eight independent metering cavities.
– All cavities actuate together via a single sliding gate.
– Ensures uniformity of charge weight across all shells.
2.2 Adjustable Charge Volume
Depending on the STL design, the user can:
– Swap metering plates for different shot weights.
– Adjust cavity depth (some versions).
– Use different shot sizes without recalibration.
2.3 High Throughput
A typical workflow:
1. Place 8 empty hulls under the channels.
2. Pull the slide → all 8 charges drop.
3. Move the tray → repeat.
Reloaders report 5–10× faster throughput compared to single‑channel scoops.
2.4 Compatibility
– Works with lead shot (дробь).
– Compatible with most Russian and European hull diameters.
– Works with 12‑gauge, 16‑gauge, and 20‑gauge depending on the printed version.
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3. Mechanical Architecture
The device typically consists of four printed parts:
Part 1 — Hopper Body
– Holds bulk shot.
– Funnels pellets toward the metering plate.
– Designed with steep internal angles to prevent bridging.
Part 2 — Metering Plate (Sliding Gate)
– Contains eight cavities of equal volume.
– Moves horizontally to:
– Fill cavities under the hopper.
– Dump cavities over the output channels.
Part 3 — Channel Block
– Eight vertical channels aligned with hull mouths.
– Designed to minimize pellet bounce and spillage.
– Requires high rigidity → printed with 5–6 perimeters and 95% infill.
Part 4 — Base Plate / Hull Alignment Tray
– Holds 8 hulls in perfect alignment.
– Ensures repeatable positioning under the channels.
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4. Materials and Printing Specifications
These are the exact parameters from the Russian instructions you posted.
4.1 Nozzle Size
– Compatible with 0.4 mm and 0.6 mm nozzles.
4.2 Print Settings
Parts 1 & 2 (hopper + slide):
– Perimeters: user preference
– Infill: user preference
– Recommended: 3–4 perimeters, 40–60% infill
Parts 3 & 4 (channel block + base):
– 5–6 perimeters
– 95% rectilinear infill
– Purpose: structural rigidity and dimensional stability
4.3 Recommended Filament
– PETG (best balance of strength + smooth sliding)
– PLA+ (acceptable, but less durable)
– ABS (excellent but requires enclosure)
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5. Assembly Requirements
The Russian text specifies:
Hardware
– DIN 965 countersunk screws
– M3×30 — 8 pcs
– M3×16 — 1 pc
These fasten:
– Hopper to channel block
– Slide rails
– Base alignment plate
Tools
– 2 mm hex key
– Light sanding block (for slide tuning)
– Optional: PTFE dry lubricant for smoother gate movement
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6. Operating Procedure
Step 1 — Fill Hopper
Pour lead shot into the hopper.
Step 2 — Prime the Metering Plate
Slide the gate to the “fill” position so all eight cavities fill.
Step 3 — Position Hulls
Place 8 empty hulls in the alignment tray.
Step 4 — Dispense
Slide the gate to the “dump” position.
All eight charges drop simultaneously.
Step 5 — Repeat
Move the tray, insert new hulls, repeat.
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7. Performance Characteristics
Charge Consistency
– Typical variation: ±1–2% depending on shot size and cavity polish.
– Larger shot (#5–#7) may require cavity smoothing.
Throughput
– Manual operation: 200–400 shells/hour
– With pre‑primed hull trays: 500+ shells/hour
Durability
– PETG version: 10,000+ cycles
– PLA version: 3,000–5,000 cycles
– ABS version: highest longevity
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8. Known Variants
Russian reloading communities often share:
– ЗАДОК 8К — original
– ЗАДОК 8КУ — improved (улучшенная)
– ЗАДОК 12К — 12‑channel version
– ЗАДОК 4К — compact 4‑channel version
– ЗАДОК‑М — modular with interchangeable metering plates
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9. Summary
The ЗАДОК 8КУ is a 3D‑printed, improved 8‑channel simultaneous shot‑pellet loader used by Russian hobbyist reloaders to speed up shotgun shell production. It is a purely mechanical, non‑weapon accessory designed for consistency, throughput, and ease of printing.
