Prusa i3 MK3S


The Prusa i3 MK3S is the culmination of the efforts of Josef Prusa, Prusa Research, and other contributors to the RepRap project over the past decade. It sets 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.

This machine uses 1.75mm filament only. Please be careful when purchasing filament.


We use PrusaSlicer and the built-in profiles for this machine. The Prusa Knowledge Base has additional information on configuration settings and advanced use.

Saving to SD Card

The SD card reader on the 3D printing computer doesn't work properly and may require you to save the file twice. Please keep this in mind when you use this machine.

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.



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.

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.


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.

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