Prusa i3 MK3S+ build volume: 250 × 210 × 210 mm — what fits, and how to print what doesn't
Quick answer: the Prusa i3 MK3S+ prints objects up to 250 × 210 × 210 mm (X × Y × Z, that is width × depth × height) — 11.0 litres, which ranks #127 of 152 printers in the dataset. The largest cube is 210 mm; a thin flat part can reach about 316 mm along the bed diagonal. Anything bigger is split into pieces with connectors — the splitter has a Prusa i3 MK3S+ preset.
What the numbers mean for your model
Build volume is quoted as the box the nozzle can reach, X × Y × Z. A model fits whole when it fits that box in some orientation, which is more forgiving than it sounds: a long flat part can lie diagonally across the 250 × 210 mm bed (diagonal 326 mm, so about 316 mm usable once a margin is left for the brim), and a tall part can stand up to 210 mm if its footprint fits. The splitter checks every orientation before it decides a model needs cutting, and reports "already fits" when it does.
When it does not fit, the number of pieces depends on which axis overflows. If only the longest dimension is too big, this is what a Prusa i3 MK3S+ needs, allowing a 2 mm margin per piece:
| Model's longest side | On the Prusa i3 MK3S+ | Piece length |
|---|---|---|
| 250 mm | 2 pieces | 125 mm each |
| 300 mm | 2 pieces | 150 mm each |
| 400 mm | 2 pieces | 200 mm each |
| 500 mm | 3 pieces | 167 mm each |
| 600 mm | 3 pieces | 200 mm each |
| 800 mm | 4 pieces | 200 mm each |
Pieces along the printer's longest axis (250 mm). A model that overflows two axes needs the product of the two counts — the splitter plans that automatically, and usually finds a layout with fewer pieces than the naive grid by rotating the model first.
Prusa i3 MK3S+ notes
The i3 MK3S+ is the printer a large share of the installed base still runs, at 250 × 210 × 210 mm. Those 10 mm less Z than the MK4 occasionally matter: a piece planned for a 220 mm tall printer will not fit standing up here, so choose the MK3S+ preset rather than a generic 250 × 210 × 220. The bed is fully usable and the textured sheet is kind to big PETG pieces. An upgrade to the MK4S keeps the X and Y numbers and adds 10 mm of height.
Printers with a similar build volume
| Printer | X × Y × Z (mm) | Litres | Rank |
|---|---|---|---|
| Prusa i3 MK3 | 250 × 210 × 210 | 11.0 | #126 |
| FlashForge Adventurer 4 | 220 × 200 × 250 | 11.0 | #128 |
| FlashForge Adventurer 5M | 220 × 220 × 220 | 10.7 | #129 |
| FlashForge Adventurer 5M Pro | 220 × 220 × 220 | 10.7 | #130 |
| Wanhao Duplicator 12 | 230 × 200 × 230 | 10.6 | #131 |
| Prusa MK4 | 250 × 210 × 220 | 11.6 | #124 |
Other Prusa printers in the dataset: Prusa Core One, Prusa i3 MK2S, Prusa i3 MK3, Prusa Mini+, Prusa MK4, Prusa MK4S, Prusa XL.
Split a model for the Prusa i3 MK3S+
- Open splicestl with the Prusa i3 MK3S+ preset selected and drop the STL, 3MF or OBJ on the page. Nothing is uploaded.
- The split runs by itself to 250 × 210 × 210 mm minus a margin, on all three axes at once. Drag a cut handle to move a seam; Shift-click the model to mark a spot a seam must avoid.
- Pick connectors — pegs by default; dovetails, finger joints, magnet pockets, dowel holes, screw joints or your own — and download the zip: one file per piece lying flat, the connectors, a README and an assembly sheet.
Frequently asked questions
What is the build volume of the Prusa i3 MK3S+?
250 × 210 × 210 mm (width × depth × height), which is 11.0 litres. That is the manufacturer's stated printable volume as used by splicestl's Prusa i3 MK3S+ preset; the physical bed may be a few millimetres larger.
What is the largest object you can print on the Prusa i3 MK3S+?
A 210 mm cube fits outright. A flat part can be longer by lying on the bed diagonal: up to about 316 mm long if it is narrow and under 210 mm tall. A tall part can stand 210 mm high if its footprint is within 250 × 210 mm. Anything that exceeds these in any orientation has to be split.
How do I print something bigger than the Prusa i3 MK3S+'s build volume?
Split it into pieces that each fit, add connectors at the cuts, print the pieces and join them. The free browser splitter at splicestl.com has a Prusa i3 MK3S+ preset: load the STL, 3MF or OBJ, choose the preset, and the model is cut on all three axes to fit 250 × 210 × 210 mm with pegs, dovetails or magnet pockets placed at every cut. Download gives one file per piece plus an assembly sheet.
Related
Source and changes. Dimensions are the manufacturer's published specification as recorded in the splicestl build-volume dataset (CC BY 4.0; the tool's preset table, read 13 October 2026). Derived figures (litres, diagonal, rank, piece counts) are computed from those three numbers by tools/build-printer-pages.py. Page published 31 October 2026. If the manufacturer has changed the specification, tell us and the dataset, the preset and this page change together.