> For the complete documentation index, see [llms.txt](https://tools.desmoinesmaker.space/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tools.desmoinesmaker.space/tool-areas/3d-printing/prusa-i3-mk3s.md).

# Prusa i3 MK3S

## About

![](/files/Yx08lfzxL7ICyvgf3GYa)

The Prusa i3 MK3S was the culmination of the efforts of Josef Prusa, Prusa Research, and other contributors to the RepRap project over the past decade. It set the standard of hobby 3D printers in terms of reliability and ease of use. A great deal of the reliability and support come from the fact that Prusa Research utilize literally hundreds of Prusa i3s to manufacture and iterate on their design.

As of 2026, Area 515's i3 MK3S printers had printed more than 12 kilometers of filament!

{% hint style="info" %}
This machine uses 1.75mm filament only. Please be careful when purchasing filament.
{% endhint %}

## Slicing

We use [PrusaSlicer](https://www.prusa3d.com/prusaslicer/) and the built-in profiles for this machine. The [Prusa Knowledge Base](https://help.prusa3d.com/en/category/prusaslicer_204) has additional information on configuration settings and advanced use.

### Prusa Connect and PrusaLink

[Prusa Connect and PrusaLink](https://help.prusa3d.com/article/prusa-connect-and-prusalink-explained_302608) are wireless options for saving and printing to the Prusa printers at Area 515. PrusaLink is a local network solution for loading and printing wirelessly and each printer has its local IP address and login information posted in the space. Members get access to the local network at Area 515 when they join. Prusa Connect is a full cloud suite which requires members create a prusa3d account and get invited to Area 515's team; this is completed during training.

### Saving to SD Card

There is a computer in the 3d printing room with an SD card reader for users to save files directly to the printer instead of using PrusaLink or Prusa Connect, if preferred. The SD card reader on the 3D printing computer is old and may require you to save the file twice. Please keep this in mind when you use this machine.

{% hint style="info" %}
Please save your files in a folder named after you. Orphaned files may be removed.

Feel free to add sub-folders to your folder as needed.
{% endhint %}

## Use

### Operation

The LCD menus are easy to navigate on this printer, and it does most of the work for you. Clicking the encoder wheel in will get you into the menu from the status screen, and rotating it will allow you to navigate the menus.

### Build Plate

Always consult the [filament material guide](https://help.prusa3d.com/filament-material-guide) to know which sheet to use with which filament. There are printed guides at the space stacked with the build-plate holder. Using the incorrect filament will permanently damage the sheet.

### Abrasive Materials

Abrasive materials, such as filaments with carbon fiber or glow-in-the-dark additives must only be printed on a printer with a hardened nozzle. The i3 MK3S does not have a hardened nozzle and cannot print abrasive materials.

### Changing Filament

If filament from someone else is currently loaded, navigate to the unload filament option, then select the type of filament you will be loading. Wait for the hotend to heat up and click in the stick to unload when prompted. Be sure to insert the end of the filament into the retainer on the spool. Insert the new filament, carefully feeding in until the extruder gears grab it. Follow the remaining instructions on the controller to complete the load.

If the printer starts empty, start from the step where you insert the filament. It will then prompt you to select the filament you are loading. Wait for it to heat up and then proceed.

## Troubleshooting

### Poor Bed Adhesion

Typically when there is poor bed adhesion, this means the buildplate is dirty. The likely culprit is finger oils from handling the plate and removing prints. The most effective way to solve this with smooth and textured PEI plates is by washing and scrubbing in the sink with dish soap. Make sure to fully dry the plate before returning it to the printer, and be careful to not get any contaminants on it after washing.

 With textured PEI specifically, a thin coating of PVA glue (disappearing purple works well) is generally required for most materials. The most consistent way to apply this is by spreading several streaks over the surface, not too thick, and then, using a wet paper towel, evenly distributing the glue over the whole surface. The glue will lather slightly, becoming slightly white and opaque, before drying clear. This coating typically lasts at least a month's worth of printing if kept clean.

Ensure the correct build plate is chosen: smooth1 or textured1. The build plates have 1st layer z-offsets created by the tool stewards. Do not adjust the 1st layer z-offset without approval from a tool steward.