How to Measure Figure Display Case: Acrylic Sizing Guide

1. Summary: The Core Formula for Case Sizing

Designing or buying a dustproof display box for anime figures, mecha models, or scale statues requires distinguishing between outer enclosure bounds and usable inner space. Failing to account for base structures, material wall thickness, or dynamic weapon extensions frequently results in physical contact with case walls, causing static friction marks or structural interference.

2. Step-by-Step Measurement Protocol for Figures

To accurately measure a collectible figure for an acrylic display enclosure, do not rely solely on official manufacturer datasheets, as they often omit extended accessories or base overhangs. Follow this 3-step physical measurement process using a flat surface and a standard framing square or calipers.

1. Establish the True Apex Height ($H_{max}$): Place the figure fully assembled on its final display base. Measure vertically from the resting surface to the highest point. Pay attention to raised sword tips, floating hair tendrils, aura effect pieces, or backpack antennae.
2. Find the Maximum Width Bounding Box ($W_{max}$): Measure the widest horizontal span perpendicular to the figure’s forward orientation. Check if extended elbows, flowing capes, or side weapons exceed the footprint of the display base.
3. Determine the Maximum Depth ($D_{max}$): Measure from the rearmost point (e.g., trailing cape, back machinery, or rear peg) to the frontmost point (e.g., outstretched hand or forward base lip).

3. Internal Clearance Rules by Figure Scale & Posture

Safety clearance prevents visual crampedness, allows adequate ventilation during assembly, and ensures high-friction accessories do not touch the acrylic walls. Recommended clearances scale according to figure size and pose complexity.

4. External vs. Internal Dimensions: Base & Wall Allowances

A frequent error when ordering display boxes is confusing internal dimensions with external physical dimensions. Acrylic fabricators manufacture enclosures based on either interior capacity or exterior fit, depending on the base mechanism.

Common Base Structural Types and Their Tolerances:

• Step-Grooved Wooden/Plastic Base: The acrylic cover fits into a milled groove inside the base perimeter. In this design, the usable internal footprint is limited by the inner edge of the groove, which typically reduces the internal length and width by 10mm to 15mm relative to the overall base dimensions.
• Flat Flush Acrylic Base with Corner Pegs: The acrylic walls sit directly on top of a flat base sheet. The internal dimension equals the external dimension minus twice the wall thickness:
  $$\text{Internal Width} = \text{External Width} – (2 \times \text{Acrylic Thickness})$$
• Interlocking slotted assembly (Flat-pack): Tab-and-slot acrylic panels feature overlapping corner joints. Allow a minimum of +5mm operational tolerance when calculating outer shelf clearance.

5. Structural Material Guidelines: Acrylic Thickness Selection

Selecting acrylic panel thickness depends primarily on structural rigidity and the height of the box. Thin sheet material on tall display cases causes panel deflection (bowing), leading to dust seal failure or joint cracking.

Note: Acrylic sheet manufacturing standard tolerances typical across cast PMMA sheets fall within approximate $\pm10\%$ nominal thickness variations per ISO 7823-1 guidelines.

6. Real-World Sizing Scenarios

Scenario A: 1/7 Scale Figure with Long Weapon

A collector measures a 1/7 scale figure: height from base to head top is 240mm, but an upright spear reaches 290mm. The maximum base diameter is 150mm, but the horizontal spear tip extends the total width to 220mm. Depth is 160mm.

• Target Height Calculation: $290\text{mm} + 30\text{mm clearance} = 320\text{mm}$
• Target Width Calculation: $220\text{mm} + 40\text{mm clearance} = 260\text{mm}$
• Target Depth Calculation: $160\text{mm} + 40\text{mm clearance} = 200\text{mm}$
• Recommended Internal Specification: $260\text{mm} \text{ (W)} \times 200\text{mm} \text{ (D)} \times 320\text{mm} \text{ (H)}$

Scenario B: Multi-Tier Blind Box Display

When arranging multiple 80mm-tall blind box figures on stepped acrylic risers, size calculations must incorporate total riser step heights:

• Riser setup: 3 tiers, each step height 40mm.
• Top tier figure height: $120\text{mm (2 steps)} + 80\text{mm (figure)} = 200\text{mm}$ total stack height.
• Minimum recommended internal case height: $200\text{mm} + 30\text{mm} = 230\text{mm}$.

7. Manufacturing Engineering Context: About S&K Acrylic Display

8. Frequently Asked Questions (FAQ)

9. Technical References