Why two 3D print quotes for the same STL can differ
You upload one STL, two makers reply, and one price is double the other. Nobody is necessarily overcharging. More often the two makers are quoting slightly different jobs, because the post left room for each of them to fill in the gaps their own way.
This guide is about that gap: what sits inside a 3D print quote, which parts of it move from one maker to the next, and what to ask so that two bids describe the same part.
How big the spread can be
Published comparisons show the spread is normal, not a sign that something went wrong.
- In 2015, Fabbaloo ran one vase-like model through a price-comparison service across nine providers. Plastic quotes ran from USD $5 to USD $811. The $5 quote was plain nylon; the $811 quote was a medical-grade, wax-like material with colour. Same file, very different jobs (Fabbaloo).
- In June 2026, All3DP quoted ten parts through Craftcloud and compared the cheapest suitable option with a higher-quality alternative for each. The alternatives cost "approximately 27% to 346% more than the cheapest suitable options" (All3DP).
In both cases, most of the gap came from choices: process, material, finish and quantity. The same choices are hiding inside the two bids on your post.
The five parts of a quote
Our price guide lists what moves the price. When you are comparing two bids, it helps to split each one into the same five lines.
| Line | What it covers | Why two makers differ here |
|---|---|---|
| Machine time | Hours the printer runs | Different printers, layer heights and orientations give different print times for the same file |
| Material | Plastic or resin the part uses | Different infill and wall settings change how much material goes in |
| Setup | File check, slicing, plate prep | Some makers show it, some fold it into a per-part minimum |
| Finishing | Support removal, sanding, priming, painting | One maker assumes raw, another assumes cleaned up |
| Shipping | Packing and carrier | Distance, carrier and box size; a nearby maker can win on total cost |
If a bid is a single number, ask the maker to break it into these lines. You don't need to the cent. You need to see which line is carrying the difference.
Where bids usually split
Process and material
"Print this" can mean FDM in PLA, FDM in PETG, resin, or SLS nylon. Each has a different price floor. Our price guide puts PLA and PETG as the most economical and nylon, carbon fibre and SLS as usually costing more per cm³. If one maker read your post as "cheapest plastic that works" and another as "strongest option", the bids will be far apart and both will be honest.
Ask: "Which process and which exact material is this quote for?"
Walls, infill and layer height
These settings decide how much material goes in and how long the printer runs. Our price guide notes that a hollow or low-infill part costs quite a bit less than a solid one, and that thicker walls and more infill take more load but burn more material and hours. All3DP's cheapest phone stand, for example, was FDM PLA at 20% infill (All3DP). A maker printing the same stand much denser would quote more for a stronger part.
Ask: "What wall count, infill and layer height did you price?"
Finish
This is the line most often left unsaid. A raw print with supports snapped off and a sanded, primed part are two different prices, and our price guide calls them "two very different prices". If the post says nothing, one maker may quote raw and another may include clean-up because they won't ship a part that looks rough.
Ask: "Is support removal included? Any sanding or priming?"
Shipping
Shipping can be a bigger share of a small order than you'd expect. In All3DP's test, shipping made up more than 40% of the delivered total for the phone stand, which made it "more influential than the selected material" (All3DP). A bid that looks cheap before shipping can lose once delivery is added.
Ask: "Is shipping in this price, and how long is transit to my postcode?"
Quantity and setup
Setup is paid once, so our price guide notes that larger batches usually get a better per-part price. All3DP saw a delivered unit-price reduction of about 98% when the clips were ordered as a batch of 100 instead of one (All3DP). If one maker priced one part and another priced the ten you mentioned "maybe later", the bids won't line up.
Ask: "Is this price for the quantity in my post? What would a reorder cost?"
Deadline
A rush deadline means jumping the printer queue. Our price guide notes that makers usually add a surcharge for that. If one maker can fit you into their normal queue and another has to bump work, their prices will differ for reasons that have nothing to do with the part.
Ask: "Does your price include any rush charge for my date?"
Making two bids comparable
Before you choose, put the bids side by side with the same columns:
| Maker A | Maker B | |
|---|---|---|
| Process and material | ||
| Walls / infill / layer height | ||
| Finish included | ||
| Quantity priced | ||
| Shipping included, and transit time | ||
| Rush charge | ||
| Total delivered |
Fill the empty cells from the bids and the makers' answers. Often the "expensive" bid turns out to include finishing and shipping that the cheap one left out. Sometimes the cheap bid is simply a better fit. Either way, you are now choosing between two descriptions of the same job.
Fix it in the post, not afterwards
Most of these questions disappear if the post answers them first. Our price guide's checklist covers the fields that matter most: the file, units, quantity, material or use, critical tolerances, finish, date in hand and ship-to location. Two extra lines help with comparison:
- "Please state process, material, infill and finish in your bid."
- "Please quote delivered to my postcode."
Makers who see those lines tend to quote in the same shape, which makes the comparison quick. You can also browse custom 3D printing services on The Spool List to see which makers work in the process you need before you post.
FAQ
Is the cheapest quote the one to take? Only if it describes the same job. Check process, material, settings, finish and shipping first. A cheap bid that leaves out finishing or delivery can cost more in the end.
Why would a maker quote more for the same STL? Usually because they priced a different material, denser settings, more finishing, a different quantity or a faster date. Ask for the breakdown and the reason is normally on one line.
Can I ask a maker to match another bid? You can ask whether they can quote the same spec as the other bid. Asking for "the same price" without the same spec just invites a maker to quietly cut something.
Should I specify infill myself? Only if you know what the part needs. Otherwise describe the load and use, and ask each maker to state the settings they chose. That way the settings are on record, and you can compare them.
When your file and details are ready, post the part free and compare bids line by line. Payment is protected until you confirm delivery.