Large-format 3D printing up to 500 mm

Large-format 3D printing is printing a part whose largest dimension exceeds the envelope of a standard desktop-class printer. At 3Descu a part counts as large once any side goes past 320 mm, and we print it in one piece on large-format FDM machines up to 500 x 500 x 500 mm. Past 500 mm the part is not refused: it is split into sections and joined, or reviewed by a person before it is quoted.

Get a free quote to see which machine class your part lands on. The calculator reads the bounding box on upload and says whether it fits the standard or the large-format fleet.

Build volumes at 3Descu

Process	Largest part in one piece	What happens past it
Resin (SLA)	300 x 250 x 250 mm	The part is split, or printed in filament instead
FDM, standard machines	320 x 320 x 320 mm	The part moves to the large-format machines automatically
FDM, large-format machines	500 x 500 x 500 mm	The part is split and joined, or sent for manual review

It is the largest single dimension that decides, not the weight or the volume. A part of 620 x 40 x 40 mm is light and still over the limit, because 620 mm fits on no plate in the building. It is also one of the easiest shapes to split. There is no large-format resin machine, so a big detailed part is usually better printed in filament; the FDM process page explains why filament scales to large geometry.

When a part is "large" in practice

Size changes three things before it changes anything else.

Height is machine time. A part is built one layer at a time, so a tall part carries many layers, and each layer takes time whatever the quantity.

One piece means one machine. A single continuous part cannot be shared between printers. However many machines are free, a large one-piece part finishes when its one machine finishes.

Long flat spans move as they cool. Materials that shrink, such as ABS, ASA and polycarbonate, bow on long flat sections. On a small part this is invisible. On a 450 mm panel it decides whether the part is usable.

Printing in one piece vs splitting into sections

Factor	One piece	Split into sections
Appearance	No seam	A seam at every joint, hidden best along an existing edge or feature
Strength	Continuous material throughout	The joint is the weakest region
Lead time	Set by one long print on one machine	Sections print at the same time on separate machines
Risk	A failure late in a long print loses the whole part	A failure loses one section, which is reprinted alone
Warping	Worst on long flat spans	Shorter spans move less
Size limit	Up to 500 x 500 x 500 mm	Beyond 500 mm, section by section
Packing	One bulky box	Flat sections pack smaller

The honest summary: print in one piece when the part fits and a seam is unacceptable, such as a sealing face or a continuous cosmetic surface. Split when the part is over 500 mm, when the deadline is tight, or when a long flat section in a shrinking material would bow. A split designed into the model at a joint that was going to exist anyway is always better than one chosen by whoever prepares the file.

Where to split a large part

Joint	Good for	Note
Butt joint with dowel pins	Almost anything	Pins can be printed or standard steel dowels
Lap or step joint	Panels and flat sections	More bonded area than a butt joint, and it self-aligns
Tongue and groove	Long spans and enclosures	Aligns in two directions and hides the seam line
Bolted flange	Structural parts and anything serviceable	The strongest option, and the only one that comes apart cleanly

Put the split where the part is already interrupted: along an edge, a rib or a change of section. Orient each section so its largest flat face sits on the plate. We do not publish a fit tolerance for mating features because we have not measured one yet, so on a new design the reliable approach is to print one pair of mating sections first, check the fit, then run the rest. More layout advice is on the design rules page.

What size changes for cost and lead time

We do not publish how the price is built, but the direction of each effect is predictable.

• A large part costs more than its material alone suggests. Large-format machines print slower than the standard fleet, rated at up to 200 mm/s against up to 500 mm/s, and a large part occupies one of them for longer. That machine time is part of the price.

• Tall parts cost more than flat parts of the same volume. More layers mean more machine hours.

• Lead time grows with the longest single print, not the total. A large one-piece part cannot be accelerated by adding machines. Splitting it is often the only lever that shortens the date.

• Quantity helps less on large parts. Small parts share a plate; a 480 mm part occupies one on its own.

• Shipping a big part means a big box. Split sections usually pack more compactly.

The calculator shows the estimated production time for your exact part and quantity, in calendar days, because the farm runs seven days a week.

Materials for large parts

Size can reverse the usual material advice, because on a large part the question is often how little the material moves as it cools.

Material	On a large part
PLA	Barely shrinks, so large flat panels stay flat. Good for display and fit models, wrong for heat or outdoors
PETG	The usual default for a large functional part indoors
ABS, ASA and polycarbonate	Shrinkage is the constraint. Add ribs or split long flat sections. ASA if the part lives outdoors
ABS CF	Holds its shape where plain ABS bows, and keeps ABS heat resistance. See ABS CF
PETG CF	Far less warping than plain PETG on long flat geometry. See PETG CF

Parts over 500 mm: what to send

A part larger than 500 mm in any direction is flagged for manual review in the calculator, and a person confirms the price. What helps the person quoting it:

1. The overall dimensions you intend. A file exported in the wrong units can trigger this flag on a part that would have fitted.

2. Whether the part may be split, and where a seam would be unacceptable.

3. What the part does, in one line. It often changes the material.

4. The quantity and the date you need it.

Put these in the notes when you upload. We print on 200+ printers under an ISO 9001:2015 quality system, and a QC report is available on request, free on orders over €500.

Get a free quote by uploading the large part as it stands. The bounding box, the machine class and a price or a review flag come back straight away.