How to Quote Post-Processing Steps

Post-processing is where quotes go sideways. A shop prices the build or the machining time perfectly, then tacks on a flat “finishing fee” that barely covers bead blasting — let alone support removal, heat treatment, threading, inspection, and packaging. The result: jobs that look profitable on paper but bleed margin on the shop floor.

If you run a 3D printing service, CNC shop, or sheet metal operation, post-processing isn’t an afterthought. It’s a distinct production phase with its own labor, consumables, equipment time, and quality gates. Here’s how to quote it rigorously.

Break Post-Processing Into Discrete Operations

Stop using a single line item. List every operation the part touches after the primary build or cut:

• Support removal (manual, ultrasonic, chemical bath)
• Heat treatment (stress relief, annealing, HIP, aging)
• Surface finishing (bead blast, tumble, polish, electropolish, anodize, powder coat)
• Secondary machining (tapping, reaming, boring, EDM)
• Inspection (FAI, CMM, CT scan, surface roughness, hardness)
• Assembly hardware (inserts, helicoils, pins, rivets)
• Packaging (anti-static, VCI, custom foam, moisture barrier)

Each gets its own labor estimate, consumable cost, and equipment allocation. That granularity also makes it easy to show customers why the price is what it is — and to drop or swap ops when they push back.

Model Labor by Operation, Not by Hour

“Finishing: 4 hours” is a guess. “Support removal: 0.5 hrs/part × 12 parts = 6 hrs at $45/hr” is a model. Build a small lookup table per operation:

• Base time per part (or per kg, per surface area)
• Setup time per batch
• Skill tier (operator, technician, specialist)
• Concurrent vs. sequential — can tumbling run while the CMM is measuring?

For additive, support removal time correlates strongly with support volume and geometry complexity. For CNC, deburring time scales with edge length and feature count. Capture those drivers in your quote engine so the math updates automatically when the part changes.

Account for Consumables and Equipment Wear

Media, chemicals, electrodes, abrasive belts, anodize rack time — these are real costs that scale with throughput. Track them per operation:

• Media consumption per kg of parts tumbled
• Chemical bath life (liters per batch, refresh cadence)
• Electrode wear per EDM hour
• Masking tape, plugs, fixtures for coating

If you outsource heat treat or anodize, bake in the vendor’s minimum lot charge, lead time, and shipping both ways. Add a handling markup (15–25%) for PO management, receiving inspection, and rework risk.

Build In Quality Gates and Rework Buffers

Post-processing is where cosmetic and dimensional specs live or die. Quote the inspection that proves compliance:

• First-article inspection (FAI) plan per AS9102 or customer spec
• In-process checks (surface roughness after blast, hardness after heat treat)
• Final CMM or CT scan time
• Documentation (CoC, material certs, FAI report, PPAP)

Add a rework allowance — typically 2–5% of post-processing labor — for parts that fail a gate and need re-blast, re-tap, or re-coat. If the customer demands zero defects, price the 100% inspection that requires.

Link Post-Processing to Upstream Decisions

The best quote engines make post-processing costs visible during the primary quote, not after. When an estimator selects a material, process, or geometry, the system should surface the downstream ops automatically:

• Inconel 718 → flags stress relief + HIP + difficult machining
• Lattice structures → flags ultrasonic support removal + CT scan
• Bent sheet metal → flags hardware insertion + powder coat masking

This prevents the classic “we didn’t know it needed heat treat” surprise two weeks into the job. It also lets sales hand customers a complete, defensible number on the first call.

Use Templates, Then Calibrate With Actuals

Start with operation templates (“Standard SLS Nylon Finish,” “Aerospace Ti-6Al-4V Heat Treat + FAI”). Apply them to the quote, then adjust quantities and rates for the specific job. After delivery, compare estimated vs. actual hours and consumables per operation. Feed the variance back into the templates. After 10–20 jobs, your post-processing quotes will be within 10% of reality — far tighter than the 30–50% swings most shops see.

Conclusion

Post-processing isn’t overhead — it’s production. Quote it with the same rigor you apply to build time or machine time: discrete operations, modeled labor, real consumables, quality gates, and a feedback loop from actuals. Your margins will reflect the difference.

Solvi’s quoting engine lets you build operation-level post-processing templates tied to materials and processes, so every quote captures the full cost automatically. See how it works.