What is the Original Prusa MK4's build volume?
250 × 210 × 220 mm (about 9.8 × 8.3 × 8.7 inches). The MK4S has the same 250 × 210 × 220 mm volume. The Prusa MINI+ is 180 × 180 × 180 mm, and the CORE One is 250 × 220 × 270 mm.
Printer guides › Original Prusa MK4
How to print models bigger than the Original Prusa MK4
The Original Prusa MK4 has a build volume of 250 × 210 × 220 mm. Unlike most printers its bed isn't square, which changes how you should line a model up before splitting.
To print something larger, split the STL into pieces that fit and join them after printing. PrintSlice does the splitting in your browser: with default settings each piece is at most 238 × 198 × 208 mm, and you can add pin, key or dovetail connectors on the cut faces so the pieces line up and snap together.
Open PrintSlice with a 250 × 210 × 220 bed
Free to split and preview, and your first model is free to download. The bed size is filled in for you.
Original Prusa MK4 at a glance
Build volume250×210×220mm
Largest piece238×198×208mm
Example4pieces
Example: A wall panel (400 × 300 × 30 mm) doesn't fit the MK4. PrintSlice splits it 2 × 2 × 1 into 4 pieces of about 200 × 150 × 30 mm, each of which fits the bed.
The MK4S has the same 250 × 210 × 220 mm volume. The Prusa MINI+ is 180 × 180 × 180 mm, and the CORE One is 250 × 220 × 270 mm.
How to split a model for the MK4
- Open PrintSlice with the MK4 bed size and drop in your STL file, or try the sample model.
- Press Split into bed-sized pieces. PrintSlice works out the smallest grid of equal pieces that fits, cutting along all three axes if it needs to.
- Open a piece's preview and click a cut face to add a key, pin or dovetail connector. Then download the pieces and slice them in PrusaSlicer as normal.
Tips for splitting on the MK4
Put the longest side along X
The MK4's bed is 250 mm left to right (X) but only 210 mm front to back (Y). PrintSlice cuts along the model's own axes, so if its longest side runs front to back, rotate it 90° in your CAD tool or slicer and export it again before splitting. The 400 × 300 mm wall panel in the example above needs 4 pieces lined up along X, but 6 if it's turned the other way.
Prusa MINI+ owners
Enter 180 × 180 × 180 for the bed. Expect more pieces than on the MK4; the same panel needs 6 on a MINI+. See the MINI+ guide.
CORE One owners
Enter 250 × 220 × 270. The extra 50 mm of height often avoids a horizontal cut on tall models. See the CORE One guide.
Start with the default clearance
Keep the 0.2 mm default to begin with, and only raise it (in that connector's settings) if a joint comes out tight.
Questions
What's the largest single piece PrintSlice makes for the MK4?
With default settings, 238 × 198 × 208 mm. PrintSlice keeps 5.6 mm clear on every side: a 2 mm safety margin you can change, plus 3.6 mm so connector tabs still fit on the bed.
Can't I just split the model in PrusaSlicer?
PrusaSlicer's cut tool is fine for one or two cuts you place by hand. PrintSlice is quicker when a model needs several: it works out every cut from your bed size, splits along all three axes in one go, and adds key, pin or dovetail connectors on the seams.
Will the printed pieces fit back together?
Yes. Each tab and socket pair is made from the same shape with a small built-in clearance (0.2 mm by default, adjustable per connector), so the pieces push together without sanding. You can choose a rectangular key, a round pin or a dovetail, which resists being pulled apart.
Is my model uploaded anywhere?
No. The splitting, connectors and 3D preview all run in your browser, so your STL file never leaves your computer.
Does PrintSlice cost anything?
Splitting and previewing is free, with no account needed, and your first model is free to download with a free account. To download more models, start a 7-day free trial (a card is needed, but you aren't charged until the 7 days are up and you can cancel before then). After that it's £3.99 a month.
Does it matter which way round my model is?
On the MK4, yes. The bed is 250 mm wide but 210 mm deep, so a model whose longest side runs left to right (along X) usually needs fewer pieces than the same model turned 90°.