Forget the mystical talk about “silk” filaments and secret pigment blends. In 2025 the smart way to nail color and performance is to start with RAL PLASTICS P1 & P2 chips—polypropylene plaques factory‑matched to the same tones your paint shop uses. No more eyeballing a laptop screen and arguing about “close enough.” If the printed part doesn’t match the physical chip, you know where the problem lies long before the customer points it out.
1 Pick Ten Chips, Not One
Choose ten RAL hues that bracket the gamut you care about: deep blue (e.g. RAL 5005), high‑chroma yellow (RAL 1021), low‑chroma grey (RAL 7047), and so on. Ten samples keep the test bed manageable while still exposing pigment extremes (one chip tells you nothing about drift on the opposite end of L*a*b*).
2 Print Two Things per Color
| Sample | What It Tells You | Quick Spec |
|---|---|---|
| Color Tile (50 × 50 × 2 mm) | ΔE00 error right off the bed and again after 24 h | 0.2 mm layers 100 % infill 205 °C nozzle |
| Dog‑Bone (ISO 527‑1 Type 1A) | Tensile strength in‑plane & through‑layer adhesion | Print flat and on‑edge Same G‑code for every color |
Use one slicer profile for every filament. If a pigment needs special temperatures to look right, it has no place in automated multicolor jobs.
3 Measure Color in Numbers, Not Feelings
- Probe each tile with a handheld spectro (e.g. SpectroDens 4) or a calibrated camera rig.
- Record CIEDE2000 ΔE versus the reference chip.
- Industry targets: ΔE ≤ 2 for consumer parts, ΔE ≤ 1 for tight cosmetics.
- Bright organics (orange, neon reds) drift the most—anything beyond ΔE 3 goes back to the vendor.
4 Break Stuff—Color Isn’t the Only Spec
Print the dog‑bones flat (axial) and standing (layer‑bond). A sub‑$500 multi‑feeder—think Bambu A1 Mini Combo or any AMS‑style add‑on—will spit these out in one run while juggling all ten colors. Our 2025 lab averages:
- Flat tensile varies ±10 % across most RAL‑matched PLA‑X brands.
- Layer adhesion is the wild card—silky or matte additives can knock strength down by 25 %.
- Mechanical outliers almost always coincide with ΔE outliers. Poor pigment dispersion hurts optics and weld strength.
5 Report It Like a Traffic Light
- Green — ΔE ≤ 1 & tensile ≥ 90 % of median.
- Yellow — ΔE 1–2 or tensile 80‑90 % (good for props).
- Red — worse than the above; quarantine the spool.
Key Takeaways
- RAL chips beat RGB mock‑ups. They’re polypropylene, just like most PLA blends, so reference and print share the same light behavior.
- One profile or it doesn’t count. If a filament demands unique settings, it’s unfit for multicolor automation.
- Color error and layer‑bond fail together. Measure ΔE first to avoid full mechanical testing on bad stock.
- Publish the numbers. EEAT isn’t a buzzword—stakeholders can audit you.
- 2025 hardware is ready. The printer is no longer the weak link; filament quality is.
Run this test for every batch, log the data in a shared sheet, and you’ll never again argue about “our red” or explain a random bracket failure. Less guessing, more printing. Go measure something.
Further Reading
- RAL Plastics P1 Chip Set Info
- RAL Plastics P2 Chip Set Info
- Official RAL Digital References – RAL FARBEN
- CIE DE2000 Formula – Wikipedia
- ISO 527‑1 Tensile Testing – ISO Standard
Printable PDF page preview:
Scanner calibration sheet will allow you to run the scanner’s preprogrammed troubleshooting routine
Click download button below to get the PDF file required for this calibration procedure.
Here’s what you need to do
Once you have your calibration sheet ready, you need to open your scanning software on your computer and look for some options or preferences menu. This software might be a part of your scanner or printer driver application kit. Once again, I cannot guide you step by step here as it might be different between different manufacturers and brands.
Different scanning applications might have these options in different locations. I usually use Windows Fax and Scan to open “New Scan” dialog then look for Change.. -> Properties -> Advanced tab to find “Calibrate” button.
This should be sufficient to perform your scanner’s calibration.
Make sure not to intervene before the scanner confirms the end of calibration procedure. Moving, touching or button pressing might affect the result in a negative way.
Tips:
• Don’t fold the sheet.
• Mind the markings and put it facing the right direction (it should be marked).
• The timing of calibration might be different based on your device model. Normally it should take up to a minute or two.
