Quoting Mistakes

Costly Quoting Mistakes AM Service Bureaus Make and How to Catch Them

A troubleshooting guide to the quoting errors that quietly kill service bureau margin, from underloaded build plates to forgotten support removal, each with the number that catches it.

The most common quoting error is pricing by part volume alone and ignoring the packing efficiency of the build. Symptom: your quotes win every time and the shop is busy but cash is flat. Root cause: you assumed 100 percent plate utilization when a real SLS or MJF build nests at 8 to 12 percent volumetric packing density, and DMLS often runs 15 to 30 percent by footprint. If you spread machine and powder cost across a full plate that only carries a third of the parts you assumed, you undercharge by 2 to 3 times. Fix: run every job through a Nesting Yield check and price machine time against the actual number of parts per build, not a theoretical maximum.

Forgetting to charge for support removal is the second silent margin killer. Symptom: metal parts quote fine but net margin lands 10 to 20 points below plan. Root cause: DMLS supports on a bracket can take 20 to 90 minutes of manual grinding, EDM, or wire cutting per part, and that labor never made it onto the line item. At a loaded rate of 45 to 75 dollars per hour, an hour of missed teardown is 45 to 75 dollars evaporating per part. Fix: estimate teardown with a Support Removal Labor Time model tied to support volume and contact-point count, and add it as a visible line, not a rounding buffer.

Quoting only the raw printed part and treating finishing as free is a classic underbid. Symptom: customers love your price, then you bleed hours in the bead-blast and dye booth. Root cause: post-processing on nylon can add media tumbling of 2 to 6 hours per batch, and vapor smoothing, dyeing, or infiltration each add setup plus per-part touch time. On metal, HIP, stress relief, heat treat, and machining of datum faces can double the printed cost. Fix: price finishing separately with a Post-Processing Quote Cost step so a 40 dollar printed part that needs machining and anodize quotes at its true 90 to 120 dollars.

Ignoring build failure exposure means your winners quietly pay for your losers. Symptom: individual jobs look profitable but the monthly P&L shows scrap eating 8 to 15 percent of output. Root cause: laser powder bed builds fail at a realistic 5 to 15 percent rate from recoater crashes, warping, or porosity, and a failed 60 hour metal build wastes machine time plus 3 to 8 kg of powder. If failure is not loaded into the quote, every quote is optimistic. Fix: use a Build Failure Exposure calculation to spread expected scrap cost, so a 10 percent failure rate adds roughly 11 percent to the good-part price rather than surprising you at month end.

Treating powder or resin as fully consumed per build overstates material cost and loses bids, while ignoring refresh understates it. Symptom: your material line swings wildly and you cannot explain it. Root cause: in MJF and SLS, only the fused portion becomes part, and unfused powder is reused at a refresh ratio, often 20 to 50 percent fresh blended with reclaimed. Charging the full 50 to 100 dollars per kg against every gram printed double counts. Fix: model true material cost with a Powder Refresh Quote Cost or Resin Service Cost step that accounts for refresh ratio and reclaim yield, then charge only consumed plus refreshed mass.

Mixing units between grams, cubic centimeters, and cubic inches produces quotes that are off by large factors. Symptom: one part quotes at 12 dollars and a geometrically similar one at 180 dollars for no clear reason. Root cause: someone entered volume in cubic inches where the sheet expected cubic centimeters, a 16.4 times error, or used bulk powder density instead of fused density, which for nylon runs about 0.95 to 1.0 g per cc versus a 0.45 bulk. Fix: lock one unit system per calculator, convert material density at the fused state, and sanity check that a fist-sized part lands near 30 to 60 cc, not 3 or 300.

Quoting fast turnaround at standard price ignores the real cost of jumping the queue. Symptom: rush orders feel like wins but the shop runs hot and standard jobs slip. Root cause: a 24 hour turnaround on a machine already at 70 to 85 percent utilization means bumping a scheduled build, idling powder handling, and paying overtime. Fix: model queue impact with a Quote Turnaround Workload tool and apply a rush multiplier of 1.3 to 2.0 times, since expedited AM work commonly carries a 25 to 100 percent premium in the market and yours should too.

The final trap is quoting off a machine rate you never recalculated. Symptom: your hourly recovery has not changed in two years while a new printer, higher power bills, and service contracts have. Root cause: machine hour rate drifts as depreciation, uptime, and maintenance change, and a rate set at 18 dollars per hour when the printer ran 90 percent uptime is wrong once real availability drops to 65 percent. Fix: refresh the number with a Machine Hour Rate Recovery calculation each quarter, and cross check every job against Service Bureau Margin so a healthy 3D Printing Quote Cost still clears your target margin after all of the above.

Published 2026-07-01.