What Drives the Cost of a Printed Part

Machine time is the largest component on most printed parts. A machine printing your part cannot print anything else, so you are renting it, and the rate reflects its capital cost.

Post-processing is labor and is frequently underestimated. Support removal, washing, post-curing, depowdering, blasting, dyeing and any sanding or coating are all hands-on time. On a cosmetic part the finishing routinely exceeds the printing.

Material is usually the smallest of the three and the one buyers examine first. Moving from a standard to a premium material changes the total less than the same money spent on reducing print time would.

Setup exists too, and it is why single parts carry a minimum. A one-off print still requires file preparation, orientation decisions, machine setup and unloading, and that overhead lands on one unit.

This is the part that changes how you should design, and it differs by process in a way that is not intuitive.

FDM and resin machines build layer by layer from the bottom, so the dominant variable is height. A part twice as tall takes roughly twice as long, almost independently of how much material is in each layer. Printing a tall thin part lying down rather than standing up can halve the time.

SLS is different. The machine heats and processes an entire powder bed regardless of what is in it, so you are effectively buying space in the build volume. A single small part in an SLS build is expensive; forty parts nested into the same build are cheap each. This is why SLS quotes fall so sharply with quantity and why suppliers batch orders.

So the same design change helps on one process and does nothing on another. Reducing height is an FDM and resin lever. Packing efficiently is an SLS lever.

Orientation first, because it is free. Reorienting a part to reduce height on FDM or resin cuts machine time directly, and it also changes how much support the part needs. Ask the supplier what orientation they plan to use.

Support reduction second. Supports cost three times: the material to print them, the machine time to print them, and the labor to remove them and clean up the scars. Overhangs beyond roughly 45 degrees, unsupported bosses and holes printed in the wrong plane all generate them. Chamfering an overhang instead of leaving it flat is often enough to eliminate support entirely.

Hollowing third, on resin and FDM. A solid block prints slowly and wastes material; hollowing it with drain holes or specifying a lower infill can cut both. On SLS hollowing helps less than expected, because the bed processes anyway, though it does reduce material.

Layer height fourth. A coarser layer height prints faster and looks worse. On a functional part nobody sees, moving from a fine to a standard layer height is a straightforward saving that many buyers never ask about.

And finally, tolerance and finish. Asking for a tighter tolerance than the process holds means machining after printing, which is a second setup on a part that was supposed to avoid setups.

Printed parts do not follow the volume curve people expect from machining, and it causes real confusion at quoting.

On machining, the first part carries programming and setup, and each part after that is cheap. On printing, there is no tooling and little setup, so the first part is relatively cheap, and the tenth part costs nearly what the first did. Printing is famously good at quantity one and unremarkable at quantity one thousand.

SLS is the partial exception, because nesting improves utilization until the build is full, after which the curve flattens again.

The practical consequence is that the crossover to machining or molding arrives sooner than teams expect. If you are reordering the same printed part repeatedly, quote it against the alternatives, because the printed price will not improve on its own.

Minimum order charges. A supplier's minimum can exceed the honest cost of one small part, which is why ordering a single bracket sometimes costs almost as much as ordering five.

Post-processing quoted separately, or not quoted at all. A price for a raw printed part is not a price for a part that looks finished. Ask what is included: support removal only, or blasting, dyeing and a coating.

Support-heavy geometry. Two parts of identical volume can differ substantially in price if one needs extensive support and the other does not, which is invisible if you are comparing on material volume.

Tight tolerance callouts that force secondary machining, turning a printed part into a printed-and-machined part with a setup cost attached.

And expedite fees, which on printing are genuinely meaningful, because the constraint is machine availability rather than material lead time.

Send the file in STEP or STL, and say what the part has to do rather than only what it has to look like. Give the quantity now and the expected annual quantity.

State the tolerance you actually need rather than a default, and say explicitly which surfaces are cosmetic. On most printed parts nothing needs to be cosmetic, and saying so removes the finishing cost.

Ask for the quote broken out: printing, material and post-processing as separate lines. Suppliers who will not break it out are difficult to compare, and the breakdown tells you which lever to pull.

Then ask three questions. What orientation will you print this in? What would this cost at a standard layer height rather than a fine one? And at my expected annual quantity, what would it cost machined or molded instead?

The last question is the one that occasionally saves a program, because printing is a lead time and complexity solution, not a volume one.