Prusa i3 MK2S KIT - P Rinting P Roblems; L Ayers B Reak a Nd S Plit W Hen P Rinting F Rom a BS M Aterial; M Odels C Ontain E Ither T Oo M Uch O R N Ot E Nough O F T He F Ilament; P Roblems W Ith F Inished M Odels

12.5 Printing problems
12.5.1 Layers break and split when printing from ABS material
ABS material has a higher thermal expansion than other materials. We suggest other
materials as PET, HIPS or PLA when you print larger models.
12.5.2 Models contain either too much or not enough of the filament
You can manage the filament flow during the print. Use the LCD-knob and choose Tune -
Flow - xx% where you can adjust the filament flow. Pronterface users can enter the value
M221 Sxx into the command line.
When you change the filament flow next print will use the same settings unless you
change it again in menu or you reset the printer or unplug it from the power source.
12.6 Problems with finished models
12.6.1 Model breaks and/or is easily damaged
A typical feature of larger models printed from ABS. If you have set the temperature
properly, the printer is away from drafts and object design is right, the printed object should
not break. The easiest way to avoid breaking or overall model fragility is to choose a different
material. The strongest are PET, HIPS and PLA; while PLA has low heat resistance,PET is
the firmest and has the lowest thermal expansion.
12.7 Updating printer firmware
Firmware update is a simple process which is done via the USB cable and a computer. With
the driver installation a program called FirmwareUpdater V2 is installed on the computer.
Latest firmwares can be found on http://www.prusa3d.com/drivers/ where you can find the
latest guide on which firmware to choose and detailed instructions for the process. Printer
will reset automatically right before the update and after the update is finished.
V2calibration.gcode is required to finish after the firmware update, see chapter 6.3.9 First
layer calibration.
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