Systematic Verification Ledger

Decision Trial

Compare two design variants side-by-side to make confident, evidence-based engineering choices.

Classification: Physical Trial Ledger
Method Focus: Comparative Trade-off Analysis
Slicer Target: PrusaSlicer 2.9.6
Core Principle One print. One question. One observable result.

Execute this workbook before printing full-scale assemblies to document physical tolerances.

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Decision Trial
Specimen Trial Reference: Decision Trial ISO/ASTM 52900 Aligned

Methodology Overview

Deciding which of two design variants to keep requires definitive physical validation rather than digital speculation. When multiple CAD concepts present competing trade-offs—such as rib-reinforced thin walls versus solid fillets—a Decision Trial produces observable data to select the optimal geometry.

Every iteration in physical manufacturing demands clear boundaries. By adhering to a rigorous single-specimen ledger, prototyping teams establish clear baselines for mechanical mating, geometric accuracy, and layer adhesion characteristics without wasteful multi-parameter compounding.

Interactive Verification Protocol

Stage 1: Establish the Isolated Variable

Define the single physical question this trial must answer. Do not modify slicer flow rate, acceleration, and layer height at the same time.

  • Document specimen nominal dimensions in CAD for Variant A and Variant B.
  • Note filament spool ID and measured caliper diameter across both specimens.
  • Lock slicer profile version to PrusaSlicer 2.9.6 default.

Stage 2: Execution and Slicing Control

Slice only the critical feature geometry to minimize run duration while maintaining identical cooling thresholds.

  • Restrict test specimen volume to under 15 cubic centimeters per variant.
  • Record bed temperature and ambient enclosure state for both print jobs.
  • Tag test artifacts directly with engraved specimen labels A and B.

Stage 3: Measurement & Ledger Sign-off

Measure using micrometers or gauge pins, and record definitive PASS/FAIL observation into your testing ledger.

  • Confirm mating friction, deflection limit, or dimensional clearance.
  • Photograph both specimens side-by-side under macro lighting.
  • Archive findings and select the winning variant before progressing to final assembly.

Ledger Parameter Matrix

Parameter Field Standard Value Observation Target
VAR-GEOMETRY Ribbed vs Solid Fillet Stiffness under 25N test load
LAYER-HGT 0.16 mm - 0.20 mm Consistent layer strength between variants
WALL-LOOPS 3 - 4 Perimeters Perimeter stiffness and snap deflection load
PRINT-TIME-DIFF ±15% Target Delta Manufacturing throughput comparison

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Engineering Observation Logs

Verified community test runs and physical specimen notes
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