# Setting up a 3D print (Software)
**Step 1: 3D File Format – .STL**\
To 3D print, you first need a 3D model. The preferred file format is **.stl**, which can be exported from CAD software such as Rhino, Fusion 360, etc. Export a separate .stl file for each part you want to print. You can load multiple .stl files into a single print job.
**Step 2: File Preparation – PrusaSlicer**\
Once you have your .stl file(s), open PrusaSlicer to prepare them for printing. PrusaSlicer is installed on the desktop in the 3D printer room, but you can also install it on your own computer. Follow the guide for installation and setup.
**Step 3: Importing the .STL Model**\
In PrusaSlicer, click **“Import” → “Import STL/3MF/STEP…”** in the top-left corner. Repeat this for each part if you have multiple files.
**Step 4: Choose your file (USB)**\
Choose your .stl file. If it is on a USB drive, you must choose the usb drive in the left menu. Click open.
**Step 5: Fix errors if needed**\
Your 3D model should now be loaded and appear in PrusaSlicer. If a warning appears on the right, hover over the warning icon and right-click to fix the errors.
**Step 6: Printer setting**\
The right side of the program is for choosing the printer type and and print setting. Start with choosing the printer version.
Choose the printer version based on what is available. We have **MK4**, **MK4S**, and **MK3** printers.
* **MK4** printers are numbered 1–10
* **MK4S** printers are numbered 11–17
* **MK3** printers are unnumbered (older models)
Check which printers are available in the printer room and select the corresponding version. The printer number is written on a yellow label. **MK4S** or **MK4** are preferred, as they are faster and provide better print quality.
**Step 7 Print setting: (Layer height)**\
The layer height determines the print quality and speed. Thicker layers print faster but produce less detail, while thinner layers take longer but give finer detail.
* **0.1 mm – Detail:** High-quality, detailed prints
* **0.2 mm – Speed:** Faster prints, suitable for simpler shapes
**Step 8: Filament**\
We always print using white, black, or grey PLA. The filament spools are changed by the staff.\
If a printer runs out of material, please contact an instructor in the workshop.
**Step 9: Supports**\
Make sure **supports are enabled** to ensure your model prints successfully.
Supports are temporary structures that hold up overhanging parts of your model during printing. Without them, the printer may attempt to print in mid-air, leading to deformation or failed prints.
Supports are designed to be easily removed after printing and usually leave little or no visible marks on the model.
The green color indicates support material
**Step 10: Infill (5-20%)**\
Infill is the internal structure that supports your 3D print.
* **5%** – Minimum for a stable print, enough to support surfaces
* **20%** – Typical for functional or structural parts
* **50%** – Useful for projects like vacuum forming
* **100%** – Use if you plan to drill, modify, or heavily load the part
Adjust the infill percentage based on the strength and purpose of your print.
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