“Transparent” is not a complete visual requirement. Do you need light to pass through, a blurred outline behind the part or a sharp view through it? Define the intended appearance and assess a real sample under agreed conditions before accepting it.
Download the English project worksheet. Open it as UTF-8 CSV, replace the guide context with your project inputs and record observations separately from acceptance decisions. Blank cells do not indicate a passed check.
Choose a precise visual goal
Use light-transmitting when only light passage matters, translucent when blurred contours are acceptable and optically clear when sharp visibility is expected. The last requirement is particularly demanding for a layered print and cannot be inferred from the filament name.
Record unwanted effects too: visible layers, a dark seam, image distortion or colour differences. These give the sample a way to pass or fail.
Fix the viewing setup
Record distance, angle, light source, distance from the source and ambient light. Bright backlighting is not comparable to a dim room. Check the exact PETG grade and datasheet conditions. If the part belongs in a lamp, also collect the lampshade's mechanical dimensions and safety questions. Visual acceptance does not resolve those questions.
Mark acceptable layer and seam locations
FFF parts contain paths and layers. Perimeter paths also have starts and ends that can produce a visible seam. Identify the main visible face and allowed seam location. Replace “invisible layers” with a boundary sample or an agreed photograph under fixed lighting.
A fictional panel specification
| Check | Planned input | Required evidence |
|---|---|---|
| Goal | Translucent, not sharp visibility | Physical sample |
| View | 500 mm, straight ahead | Marked setup |
| Light | One lamp 100 mm behind panel | Same source and distance |
| Primary face | Smoothest broad face | Front photo ID |
| Seam | Outside central illuminated area | Seam-location photograph |
| Thickness | To be confirmed | Sample revision |
This is a synthetic planning example with no physical result. It does not establish clarity, lampshade suitability or thermal safety. Replace every value with your own application and the actual filament and colour.
Test representative geometry
Use the intended thickness, geometry, orientation, colour and seam strategy. A flat coupon cannot prove the light pattern through a curved object. Change one factor at a time. Photograph under fixed exposure conditions and add a direct visual observation: camera processing can change apparent brightness and colour.
Decide from the agreed appearance criteria
Accept only when light passage, outline visibility, layers and seam location meet the agreed setup. Otherwise revise material route, shape, thickness or expectation and test again. Without a real sample, a visual guarantee is unproven. A grade's datasheet cannot establish the appearance of your printed geometry.
Request the visual decision first
If appearance determines the choice, request a visual prototype with a setup photograph, desired visibility, thickness and primary face. Ask for a representative portion rather than assuming a flat sheet validates a curved final part.
For use in lighting, take that preference and the mechanical and light-source details to custom 3D-printed lamps. Appearance, heat suitability and mounting need separate assessments. If the execution is already defined and you need the print assessed, use the 3D printing service.