Introduction: The Importance of Refined Cost Accounting
Coarse cost accounting is a key factor constraining the profitability of 3D printing companies. Research shows that more than 60% of service providers cannot accurately calculate the true cost of a single order, leading to pricing errors and profit loss.
I. Current Issues in Cost Accounting
1.1 Single-Dimension Accounting
Traditional cost accounting often only considers material costs, overlooking hidden costs such as equipment depreciation, labor expenses, energy consumption, and management fees, resulting in understated costs.
1.2 Inaccurate Data Collection
Lacking a systematic data collection mechanism, key data such as material consumption and equipment operating hours rely on manual estimation, with errors as high as 20%-30%.
1.3 Unreasonable Cost Allocation
Indirect expenses are allocated without a scientific basis. Projects of varying complexity use a uniform allocation rate, causing imbalanced cost distribution.
II. Refined Cost Accounting System
2.1 Direct Cost Accounting
Direct costs include material costs and direct labor costs:
| Cost Item | Calculation Method | Data Source |
|---|---|---|
| Main material cost | Model volume × density × unit price × utilization coefficient | Material purchase price |
| Support material cost | Support volume × density × unit price | Material purchase price |
| Direct labor | Operating time × hourly wage | Staff wages |
| Post-processing labor | Processing time × hourly wage | Staff wages |
2.2 Equipment Hour Allocation
Equipment costs are allocated based on actual occupied operating hours:
- Equipment depreciation: Original equipment value ÷ depreciation period ÷ annual operating hours × occupied hours
- Equipment energy consumption: Power × operating time × electricity rate
- Maintenance cost: Annual maintenance fee ÷ annual operating hours × occupied hours
2.3 Indirect Expense Allocation
Indirect expenses need to be reasonably allocated to each project:
- Site rent: Allocated by equipment floor area
- Management staff: Allocated by number of projects or operating hours
- Utilities: Allocated by actual consumption or operating hours
- Quality inspection: Allocated by number of inspections or operating hours
III. Material Consumption Tracking System
3.1 Real-Time Consumption Monitoring
Establish a real-time monitoring system for material consumption:
- Material in/out inventory registration
- Recording material consumption during the printing process
- Weighing and recycling scrap
- Material utilization statistics
3.2 Utilization Analysis
Analyze material utilization rates for different processes:
| Process Type | Material Utilization Rate | Scrap Rate | Recyclability |
|---|---|---|---|
| FDM | 85%-95% | 5%-15% | 0% |
| SLA | 90%-98% | 2%-10% | 0% |
| SLS | 50%-70% | 30%-50% | 40%-60% |
| SLM | 95%-98% | 2%-5% | 90%+ |
3.3 Cost Optimization Directions
Reduce costs through material management:
- Optimize nesting/layout to improve utilization
- Recycle powder for repeated use
- Reduce unit prices through bulk purchasing
- Reduce material loss and waste
IV. Labor Cost Accounting
4.1 Standardized Working Hours
Establish a standard working hours database:
- Standard working hours for model processing
- Standard working hours for equipment operation
- Standard working hours for post-processing
- Standard working hours for quality inspection
4.2 Working Hours Recording System
Achieve accurate recording of working hours:
- Scan code to start/finish work
- Automatic calculation of working hours
- Flagging of abnormal working hours
- Efficiency analysis reports
4.3 Labor Cost Optimization
Improve labor efficiency and reduce costs:
- Automated equipment reduces labor
- Standardized processes improve efficiency
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