How do I find a model's bounding box?

Drop the model on the plate in your slicer and read the size readout, which lists the width, depth and height of the bounding box in millimetres. Sketching software and mesh editors show the same three numbers. If a raised arm, a spear tip or a cape sticks out, measure the extremes with the slicer's measuring tool rather than trusting a tidy number, because the box is what has to fit.

Does the checker work for resin and filament printers?

Yes. The limit being tested is the machine's travel envelope, and it is the same arithmetic on an MSLA printer and an FDM printer. What differs is everything around it: a resin part hangs from the plate and needs drain holes and support bases, while a filament part sits on the bed and needs a brim or skirt for adhesion. The clearance field is where you account for those additions, per axis.

Why does my slicer say the model is too big when the checker says it fits?

Slicers reserve room you did not type: a skirt or brim around the first layer, a prime line at the edge of the plate, a wipe tower for multi-colour printing, and in some firmware a few millimetres of margin near the edges. Raise the clearance until the spare gap covers what your slicer adds, or drop the model on the plate and read the size the slicer reports for the whole arrangement instead of the model alone.

Can I print an oversized model by tilting it?

Sometimes, and this checker does not test arbitrary angles. It only scores six axis-aligned orientations, so 'does not fit' means 'does not fit in those six'. A rectangular 110 x 10 x 10 mm part misses a 100 mm cube in all six, but turned 45 degrees in the XY plane its X and Y extents become (110 + 10) / sqrt(2) = 84.85 mm, which fits. Real mesh shape, supports and slicer placement decide whether an angled print is practical, so take the model to a slicer before giving up on it.

How much clearance should I leave?

Two millimetres per axis is a reasonable default for a raft or a skirt on a resin or filament machine, and 5 mm or more is sensible when you print several parts at once and need room to cut them apart. Use 0 only when you want to know whether the bare bounding box fits mathematically: two 100 mm cubes with 100 mm build axes and 0 clearance fit exactly, but real printer tolerance, a brim, supports or a raft can still need room. The clearance is added to each axis as a whole, so it is the total room you want, not the gap on each side.

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3D Printer Build Volume Checker

Measure the model in your slicer, type its bounding box, and see whether it fits your machine before you waste a plate. The checker reports the spare gap on every axis, which of the six axis-aligned orientations fits best, how far a uniform scale would shrink the box, and how many copies fit in one layer.

The model bounding box

Read the size box in your slicer, or measure the printed part with calipers. All values are in millimetres.

Width (X)

The dimension that lands across the plate.

Depth (Y)

The dimension that lands across the plate.

Height (Z)

The dimension that becomes the print height in this orientation.

Your printer

Build volume

10-inch 12K workhorse for squads and monsters. Nominal manufacturer figures: check the build volume your slicer has configured, because firmware limits and aftermarket plates move it by a few millimetres.

Clearance to leave per axis (mm)

Extra room you want on every axis for a raft, a brim, support bases or the vat lip. Use 0 for the bare bounding box. It is a per-axis allowance, not a per-side one.

Fit report

Fits after one move — spun 90° on the plate leaves 16.9 mm spare.

Verdict: Fits after reorienting
Orientation: Spun 90° on the plateSpin it 90° about the vertical axis: the model's width and depth swap places and the height stays the same.
Tightest axis: 16.9 mmspare on the width
Plate footprint: 200 × 60 mm44.6% of the plate
Print height: 90 mmof 220 mm available
Copies per plate: 11 across × 1 deep, single layer
Scale needed to fit: shrinking every axis by the same factor

Space on each axis

The model box plus your clearance, compared with the build volume in the orientation named above.

Model dimensions, clearance and spare space on each printer axis
Axis	Model + clearance	Build volume	Spare / over
Width (X)	202 mm	218.9 mm	16.9 mm spare
Depth (Y)	62 mm	122.9 mm	60.9 mm spare
Height (Z)	92 mm	220 mm	128 mm spare

Every orientation, scored

These six axis-aligned permutations are the only placements this checker scores. They are not the only way a box can fit: arbitrary angles can reduce the footprint, and a mesh can differ from its box. The table keeps the axis-aligned option that changes the part least and still fits.

Build volume fit for each of the six axis-aligned bounding box orientations checked
Orientation	Width	Depth	Height	Result
As oriented	60 mm	200 mm	90 mm	over by 79.1 mm
Spun 90° on the plate	200 mm	60 mm	90 mm	fits, 16.9 mm spare
Rolled onto its side	60 mm	90 mm	200 mm	fits, 18 mm spare
Tipped 90° forward	90 mm	200 mm	60 mm	over by 79.1 mm
Stood on end	200 mm	90 mm	60 mm	fits, 16.9 mm spare
Laid face down	90 mm	60 mm	200 mm	fits, 18 mm spare

Other angles

This check scores the six axis-aligned orientations only. Arbitrary angles and the real mesh are not tested, and a tilt can change the footprint: a 110 x 10 x 10 mm rectangle misses a 100 mm cube in all six of them, but turned 45 degrees in the XY plane its X and Y extents become (110 + 10) / sqrt(2) = 84.85 mm. Whether an actual part fits at an angle depends on its mesh, supports and the slicer's placement, so confirm angled ideas in a slicer rather than here.

Copy-ready fit report

3D printer build volume check
Build volume: 218.9 × 122.9 × 220 mm
Model bounding box: 60 × 200 × 90 mm
Clearance allowed per axis: 2 mm

Verdict: Fits after reorienting
Orientation: Spun 90° on the plate — Spin it 90° about the vertical axis: the model's width and depth swap places and the height stays the same.

Space on each axis (model + clearance vs build volume)
Width (X): 202 mm of 218.9 mm — 16.9 mm spare
Depth (Y): 62 mm of 122.9 mm — 60.9 mm spare
Height (Z): 92 mm of 220 mm — 128 mm spare

Plate footprint: 200 × 60 mm (44.6% of the plate)
Height used: 90 mm of 220 mm
Copies per plate at this footprint: 1 (1 across × 1 deep, one layer)

Other angles: This check scores the six axis-aligned orientations only. Arbitrary angles and the real mesh are not tested, and a tilt can change the footprint: a 110 x 10 x 10 mm rectangle misses a 100 mm cube in all six of them, but turned 45 degrees in the XY plane its X and Y extents become (110 + 10) / sqrt(2) = 84.85 mm. Whether an actual part fits at an angle depends on its mesh, supports and the slicer's placement, so confirm angled ideas in a slicer rather than here.

Bounding-box arithmetic only: supports, rafts, hollowing and drain holes are not modelled beyond the clearance you entered.

How to check a model against your build volume

Get the bounding box. In your slicer, drop the model on the plate and read the size readout. If you are still choosing a model, measure the widest, deepest and tallest points of the mesh with the slicer's measuring tool.
Type the three dimensions. Width is X, depth is Y and height is Z, exactly as the slicer lists them. Millimetres only — that is the unit every slicer reports.
Pick your printer, or type the volume. The list carries common resin and filament machines. Choose Custom build volume for anything else, including a printer you have modified.
Allow for clearance. A raft, a brim, support bases and the vat lip all eat into the plate. Two millimetres per axis is a safe default; use 0 for the bare box.
Read the verdict and the orientation table. If the part does not fit as oriented, the table shows which of the six axis-aligned rotations does. If none of them does, that is a verdict about those six checks, not proof that no angle can work — confirm the actual model in a slicer.

Reading the report

The spare gap is the build volume minus the model box minus the clearance, on the axis with the least room. Positive means it fits with room to spare; negative means it is over. The tightest axis is the one that decides the answer, so that is the number to watch.

The orientation table scores six axis-aligned ways a rectangular box can sit: as oriented, spun 90° on the plate, rolled onto its side, tipped forward, stood on end and laid face down. Those six are a useful checklist, not the complete set of placements. Rotating a box to an arbitrary angle can sometimes shrink one footprint dimension while growing another, and a real mesh is not a box at all. When the six checks all fail, take the model to a slicer rather than treating the result as proof that no orientation can work.

When none of the six fits, the report gives the uniform scale that would bring the box under the limit on every axis at once. Treat that as arithmetic, not a recommendation: printing at 78% is a different miniature. Splitting is not prescribed here because the box cannot tell you where to cut; use your slicer's cut or planar-cut tools and check wall thickness, keys and supports on the actual mesh.

The copies per plate figure is the fit checker's bonus: the same footprint maths that decides one model fits tells you how many fit side by side in a single layer, using the clearance as the gap between parts.

Worked example: a 200 mm wall section on a Saturn 4 Ultra

A ruined wall section measures 60 × 200 × 90 mm and the machine has a 218.88 × 122.88 × 220 mm build volume. With 2 mm of clearance, the wall as oriented needs 202 mm of depth, and only 122.88 mm is available — over by 79.1 mm.

Spinning it 90° about the vertical axis puts the 200 mm length across the plate: 202 mm of 218.88 mm, 62 mm of 122.88 mm and 92 mm of 220 mm. Everything fits with 16.9 mm to spare on the tightest axis. Nothing else changed — same model, same layer height, same supports.

Why this checker does not test arbitrary angles

The orientation table is deliberately simple: it tests six axis-aligned placements of a bounding box. That is not the same as proving a part cannot fit. A rectangular 110 × 10 × 10 mm part misses a 100 mm cube in all six, yet turned 45° in the XY plane its X and Y extents are (110 + 10) / √2 = 84.85 mm, so it fits. Any angled placement changes both footprint axes at once, and a real mesh can fit where its box does not.

So when all six checks fail, the honest answer is “not in these six orientations”. Test the model itself in your slicer, where you can rotate it freely, see the true extents and add supports. A slicer, not a bounding-box calculator, decides whether an angled print is practical.

What this checker does not do

It works on bounding boxes, not meshes. A raised arm or a spear tip that pokes outside the box you typed is not counted, so measure the extremes.
It does not read STL, 3MF or sliced files, and it does not talk to your slicer. Everything comes from the numbers you type.
It does not plan supports, drain holes, hollowing or exposure times, and the clearance field is the only allowance it makes for them.
It does not test arbitrary rotations or mesh geometry, and it does not predict whether an angled print will fit. The 110 × 10 × 10 mm example above shows why a six-orientation “no” is not a proof; confirm angled placements in a slicer.
Build volumes are the nominal figures the manufacturers publish. Your firmware, plate and vat can move the real limit by a few millimetres, so treat the answer as a planning check and not as a guarantee.
It never sends or stores your numbers. Every figure is calculated in this page, in your browser.

Frequently asked questions

How do I find a model's bounding box?: Drop the model on the plate in your slicer and read the size readout, which lists the width, depth and height of the bounding box in millimetres. Sketching software and mesh editors show the same three numbers. If a raised arm, a spear tip or a cape sticks out, measure the extremes with the slicer's measuring tool rather than trusting a tidy number, because the box is what has to fit.
Does the checker work for resin and filament printers?: Yes. The limit being tested is the machine's travel envelope, and it is the same arithmetic on an MSLA printer and an FDM printer. What differs is everything around it: a resin part hangs from the plate and needs drain holes and support bases, while a filament part sits on the bed and needs a brim or skirt for adhesion. The clearance field is where you account for those additions, per axis.
Why does my slicer say the model is too big when the checker says it fits?: Slicers reserve room you did not type: a skirt or brim around the first layer, a prime line at the edge of the plate, a wipe tower for multi-colour printing, and in some firmware a few millimetres of margin near the edges. Raise the clearance until the spare gap covers what your slicer adds, or drop the model on the plate and read the size the slicer reports for the whole arrangement instead of the model alone.
Can I print an oversized model by tilting it?: Sometimes, and this checker does not test arbitrary angles. It only scores six axis-aligned orientations, so 'does not fit' means 'does not fit in those six'. A rectangular 110 x 10 x 10 mm part misses a 100 mm cube in all six, but turned 45 degrees in the XY plane its X and Y extents become (110 + 10) / sqrt(2) = 84.85 mm, which fits. Real mesh shape, supports and slicer placement decide whether an angled print is practical, so take the model to a slicer before giving up on it.
How much clearance should I leave?: Two millimetres per axis is a reasonable default for a raft or a skirt on a resin or filament machine, and 5 mm or more is sensible when you print several parts at once and need room to cut them apart. Use 0 only when you want to know whether the bare bounding box fits mathematically: two 100 mm cubes with 100 mm build axes and 0 clearance fit exactly, but real printer tolerance, a brim, supports or a raft can still need room. The clearance is added to each axis as a whole, so it is the total room you want, not the gap on each side.

When to use this checker, and where to check next

Reach for it before you slice, whenever a part sits close to the machine's limit or you are picking a printer for a specific job. Terrain is where the build volume bites first — long wall sections, oversized bases and multi-part kits are the parts that do not fit as modelled, and they are also the parts where splitting a print is the normal answer rather than a compromise.

Once the part fits, the next questions are what it costs to print and how many you can run per plate. The cost calculator uses the same model figures you just typed, and the scale converter settles what size a miniature should be before you slice it.