The short answer
On an aluminum finishing RFQ, **laser mark before Type II anodize** and **laser mark after anodize** are not the same quote package. Pre-anodize marks can wash out, tint differently, or need deeper engraving. Post-anodize marks sit on the dyed oxide and often read cleaner for serials—but may remove color locally or need mask rules. Silence on mark order is what widens many [quote-new.php](https://3dwk.com/quote-new.php) **rates.v1.1** estimate bands—not the logo size alone.
This guide is for buyers packaging prismatic aluminum electronics and automation RFQs. Illustrations use an **Example part** only—not a customer enclosure. Related finish notes live in [as-machined before Type II anodize](https://3dwk.com/resources/as-machined-before-type-ii-anodize), [how anodize choice changes CNC RFQ cost](https://3dwk.com/resources/how-anodize-choice-changes-cnc-rfq-cost), and [chem film vs Type II anodize aluminum](https://3dwk.com/resources/chem-film-vs-type-ii-anodize-aluminum); here we focus on **when to mark before vs after anodize** so estimators do not guess.
What before vs after means for quoting
Pre-anodize laser (or mechanical engrave) happens on bare aluminum; the oxide then grows over or around the mark. Post-anodize laser usually ablates dye/oxide to create contrast. Process pages for electronics-thermal and automation aluminum ([CNC 3-axis Al 6061 electronics-thermal](https://3dwk.com/en/cnc-3axis/al-6061/electronics-thermal.html), [CNC turning Al 6061 electronics-thermal](https://3dwk.com/en/cnc-turning/al-6061/electronics-thermal.html), [CNC 3-axis Al 6061 automation](https://3dwk.com/en/cnc-3axis/al-6061/automation.html)) assume clear mark-order notes when lots mix serials with dyed Type II.
Do not write only “laser logo somehow.” Put **MARK BEFORE ANODIZE** or **MARK AFTER ANODIZE**, plus depth / contrast intent, on the PDF and mirror it in RFQ text. Background: [DFM checklist before an online CNC quote](https://3dwk.com/resources/dfm-checklist-before-online-cnc-quote), [what files to send for a CNC quote](https://3dwk.com/resources/what-files-to-send-for-cnc-quote).
Contrast, dye and Type II / Type III
Black Type II often gives good post-anodize laser contrast; clear Type II can look subtle. Hardcoat (Type III) changes mark response and wear. Soft stock (PA66 time coeff ×0.8 under **rates.v1.1** estimates) is usually not the anodize story—aluminum is. Harder alloys (17-4PH ×1.4) are different finish paths entirely; aggressive “laser + hardcoat somehow” asks frequently auto-route toward **needs_manual** when process stacks exceed planning bands.
If the mark must survive abrasion, say whether a deeper engrave before coat is preferred over a surface ablation after dye.
Bar $/kg planning bands (estimates only): aluminum 6061 is typically far below hot alloys; finish and mark labor dominate this story more than bar cost.
Mask maps and keep-outs
Selective anodize, chem film windows, and laser zones interact. A mark zone that sits inside a mask-off area needs a keep-out map the same way soft jaws need clamp maps. Related: [hard anodize vs electroless nickel wear](https://3dwk.com/resources/hard-anodize-vs-electroless-nickel-wear), [powder coating vs painting metal parts](https://3dwk.com/resources/powder-coating-vs-painting-metal-parts).
Tolerance and inspection traps
Serial human-readable height without OCR/contrast criteria, or 100% photo of every mark on a 500-piece lot, widens QA bands. Default cosmetic marks to a sample board and put functional serial rules only where traceability matters. Related: [CMM sampling plans for CNC lots](https://3dwk.com/resources/cmm-sampling-plans-for-cnc-lots), [surface roughness Ra for machined parts](https://3dwk.com/resources/surface-roughness-ra-for-machined-parts).
Illustration 1 shows an **Example part** with a pre-anodize deep engrave zone versus a post-anodize contrast mark on a dyed face.
Example part walkthrough
**Example part:** 6061-T6 plate ~80×50×8 mm, Type II black, human-readable serial 2.5 mm tall on one flat face, ISO 2768-m general. With STEP + DXF of mark + **MARK AFTER ANODIZE — contrast on dye OK**, expect a usable automatic planning band on [quote-new.php](https://3dwk.com/quote-new.php). Same geometry with “laser logo” only and silent order often lands DFM notes or **needs_manual**—without inventing any customer PO.
Illustration 2 contrasts a vague RFQ (“laser then anodize somehow”) versus a labeled before/after block and the clearer estimate path.
Artwork formats and fixture marks
Vector DXF/SVG of the mark zone beats screenshots. Say font height, stroke width, and whether a machine-readable code sits beside the human serial. Fixture witness marks from soft jaws can land inside a logo pad—call keep-outs the same way you call anodize mask maps. Related: [how workholding changes a CNC quote](https://3dwk.com/resources/how-workholding-changes-cnc-quote), [as-machined before Type II anodize](https://3dwk.com/resources/as-machined-before-type-ii-anodize). Under **rates.v1.1** estimates, unclear artwork is a common path to **needs_manual** even when the CNC envelope is simple.
What widens bands fastest
Silent mark order, conflicting mask maps, “must match Pantone after laser,” and 100% photographic acceptance with no sample board. Quantity breaks help unit mark cost but do not erase process-order risk—see [how quantity breaks change CNC unit cost](https://3dwk.com/resources/how-quantity-breaks-change-cnc-unit-cost) and [what needs_manual means](https://3dwk.com/resources/what-needs-manual-means-preliminary-quote).
Finish stack with chem film
Some buyers ask chem film under Type II windows plus laser on bare pads. That is a different stack than mark-after-dye. Name the stack explicitly—see [chem film vs Type II anodize aluminum](https://3dwk.com/resources/chem-film-vs-type-ii-anodize-aluminum)—so estimators do not assume a single anodize bath plan under **rates.v1.1** estimates.
What to do next
Mark **BEFORE** or **AFTER** anodize, attach mark artwork, state contrast / depth intent, then upload on [quote-new.php](https://3dwk.com/quote-new.php). Service pages: [CNC machining](https://3dwk.com/cnc-machining-service.php), [materials](https://3dwk.com/materials.php). Treat **rates.v1.1** min/mid/max as estimates, not invoices. If the UI shows **needs_manual**, answer the mark-order questions rather than forcing a fake firm price.
Common questions
Does post-anodize laser always look better?
Often for dyed Type II serials, yes—but it can remove color locally. If uniform dye is mandatory, consider pre-mark depth or a separate label pad.
Can I mark after hardcoat the same way?
Not always. Type III response differs; expect wider bands or sample parts under **rates.v1.1** estimates.
Do I need a DXF for every logo?
Yes for automatic planning. Raster-only screenshots force manual interpretation and often **needs_manual**.
Should powder coat follow the same before/after habit?
Yes in spirit—mark order relative to coat still belongs on the RFQ—see [powder coating vs painting metal parts](https://3dwk.com/resources/powder-coating-vs-painting-metal-parts).