Printer guides › Elegoo Neptune 4 Pro
The Elegoo Neptune 4 Pro has a build volume of 225 × 225 × 265 mm. It's a fast, popular bed-slinger, and long models outgrow its 225 mm bed quickly.
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 213 × 213 × 253 mm, and you can add pin, key or dovetail connectors on the cut faces so the pieces line up and snap together.
Free to split and preview, and your first model is free to download. The bed size is filled in for you.
Example: A model car body (400 × 180 × 120 mm) doesn't fit the Neptune 4 Pro. PrintSlice splits it 2 × 1 × 1 into 2 pieces of about 200 × 180 × 120 mm, each of which fits the bed.
Its PEI sheet measures 235 × 235 mm, but Elegoo lists the printable area as 225 × 225 mm, so use 225. The Neptune 4 Max is much larger, at 420 × 420 × 480 mm.
The plate is bigger than the area the nozzle can actually print on. Use Elegoo's 225 × 225 mm printable size so pieces don't end up hanging off the edge.
On a fast bed-slinger, tall narrow pieces can shake loose. Lay them on a flat side, use a brim, or lower the speed for those pieces only.
Before printing every piece, print the two pieces that share one seam and test the fit. If it's tight, raise the clearance to 0.3 mm and download again.
225 × 225 × 265 mm (about 8.9 × 8.9 × 10.4 inches). Its PEI sheet measures 235 × 235 mm, but Elegoo lists the printable area as 225 × 225 mm, so use 225. The Neptune 4 Max is much larger, at 420 × 420 × 480 mm.
With default settings, 213 × 213 × 253 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.
OrcaSlicer'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.
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.
No. The splitting, connectors and 3D preview all run in your browser, so your STL file never leaves your computer.
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.