The short answer
On a CNC production RFQ, **nested multi-up** and **one-up** lots are not the same quote package. Nesting can share fixtures, reduce setup minutes per piece, and improve plate yield. One-up keeps changeovers simple, protects fragile features, and often wins when scrap risk or fixture complexity outweighs nesting savings. Silence on lot strategy is what widens many [quote-new.php](https://3dwk.com/quote-new.php) **rates.v1.1** estimate bands—not the part envelope alone.
This guide is for buyers packaging prismatic aluminum production RFQs. Illustrations use an **Example part** only—not a customer fixture. Related quantity and workholding notes live in [how quantity breaks change CNC unit cost](https://3dwk.com/resources/how-quantity-breaks-change-cnc-unit-cost), [how workholding changes a CNC quote](https://3dwk.com/resources/how-workholding-changes-cnc-quote), and [prototype vs production CNC quotes](https://3dwk.com/resources/prototype-vs-production-cnc-quotes); here we focus on **how to label nest vs one-up intent** so estimators do not guess.
What “nest” and “one-up” mean for quoting
Nesting means multiple parts share one blank, tombstone face, or fixture plate in a single setup cycle. One-up means each part is held and finished essentially alone (or in a dedicated fixture cavity). For quoting, also say whether nesting is buyer-preferred, shop-optional, or forbidden for serialization / scrap isolation. Process pages for aluminum automotive and automation parts ([CNC 3-axis Al 6061 automotive](https://3dwk.com/en/cnc-3axis/al-6061/automotive.html), [CNC 5-axis Al 6061 automotive](https://3dwk.com/en/cnc-5axis/al-6061/automotive.html), [CNC turning Al 6061 automotive](https://3dwk.com/en/cnc-turning/al-6061/automotive.html)) assume clear lot notes when volumes jump from prototypes to hundreds.
Do not bury “machine as many as fit” inside a notes balloon. Put **NEST OK** or **ONE-UP ONLY** on the RFQ and mirror it in CAD notes when serialization or cosmetic faces matter. 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).
Fixture share, scrap and yield
Nested lots amortize vise or vacuum-fixture minutes across more pieces, but a crash or soft-jaw miss can scrap several parts at once. Soft stock (PA66 time coeff ×0.8 under **rates.v1.1** estimates) still needs chip clearance between nest neighbors. Harder alloys (17-4PH ×1.4, IN718/IN625 ×2.5, CoCr ×2.2) amplify tool-wear risk across a nest; aggressive nest density on hot alloys frequently auto-routes toward **needs_manual**, especially when the line mid exceeds configured planning bands (e.g. above ~$2000 for hot alloys/CoCr).
If each piece needs unique laser serials or first-article holds, say so—nesting may still help roughing while finishing stays one-up.
Bar $/kg planning bands (estimates only): PA66 ~5, 17-4PH ~9, IN718 ~55, IN625 ~60. Material yield from plate nesting can matter more than bar $/kg on thin prismatic blanks—see [plate vs billet stock for CNC aluminum](https://3dwk.com/resources/plate-vs-billet-stock-cnc-aluminum) and [how stock size changes a CNC quote](https://3dwk.com/resources/how-stock-size-changes-cnc-quote).
Quantity breaks vs nesting
Quantity breaks and nesting interact but are not identical. A 50-piece one-up lot can still beat a poorly nested 50-piece plate if fixture time dominates. Conversely, a well-nested 100-piece plate can undershoot a simple break table if skim and tabbing are planned. Related: [reading preliminary online quote min/mid/max](https://3dwk.com/resources/reading-preliminary-online-quote-min-mid-max), [what needs_manual means](https://3dwk.com/resources/what-needs-manual-means-preliminary-quote).
Tolerance and tabbing traps
Tight flatness across a nest plate can fight tabbing and release stress. Default non-critical features to ISO 2768-m and put functional tolerances only on locating or sealing faces. Related: [datum schemes for multi-setup CNC parts](https://3dwk.com/resources/datum-schemes-for-multi-setup-cnc-parts), [surface roughness Ra for machined parts](https://3dwk.com/resources/surface-roughness-ra-for-machined-parts), [CMM sampling plans for CNC lots](https://3dwk.com/resources/cmm-sampling-plans-for-cnc-lots).
Illustration 1 shows an **Example part** nest layout with shared tabs versus a one-up vise plan.
Example part walkthrough
**Example part:** 6061-T6 plate blanks ~80×50×12 mm, lot of 120 automotive sensor brackets, NEST OK on 12.7 mm plate with 3 mm tabs, ONE-UP finish pass for Datum A face if warpage exceeds 0.05, ISO 2768-m general, critical hole true position 0.1. With STEP + clear nest/one-up notes, expect a usable automatic planning band on [quote-new.php](https://3dwk.com/quote-new.php). Same geometry with silent CAD and “whatever is cheapest” often lands DFM notes or **needs_manual**—without inventing any customer PO.
Illustration 2 contrasts a vague RFQ (“produce somehow”) versus a labeled nest/one-up block and the clearer estimate path.
What widens bands fastest
Unlabeled mix of nest and one-up expectations, “max density” without scrap-isolation rules, conflicting cosmetic notes on tab faces, and 100% CMM of every nest piece with no sampling plan. Quantity breaks help unit cost but do not erase fixture risk—see [how quantity breaks change CNC unit cost](https://3dwk.com/resources/how-quantity-breaks-change-cnc-unit-cost).
What to do next
Mark the lot **NEST OK** or **ONE-UP ONLY**, state tab / serial / FAI rules, 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 nest-density questions rather than forcing a fake firm price.
Common questions
Can the shop always choose nesting without asking?
Often yes for simple prismatic parts—but say if serialization, plating racks, or scrap isolation forbid it. Silent “cheapest method” notes still widen bands when cosmetics fight tabs.
Does nesting always lower unit cost?
Not always. Sparse nests with heavy tabbing or fragile walls can cost more than one-up. Fixture minutes and scrap risk drive the **rates.v1.1** band as much as plate yield.
How do hot alloys change nest quotes?
Tool wear and heat in IN718/IN625/CoCr raise machine-time under **rates.v1.1** coeffs (×2.5 / ×2.2 estimates). Expect wider bands or manual review when nest density is aggressive.
Should prototypes follow the same nest rules?
Usually start one-up for learning, then open NEST OK for production—see [prototype vs production CNC quotes](https://3dwk.com/resources/prototype-vs-production-cnc-quotes).