How to print with the Mendel 90

(only for ABS filament - use the Ultimaker for PLA printing)


  1. Get or create your 3D model. 
  2. Export it to STL (if necessary). STL is a file format understandable by all 3D slicer


FCH : 26/05/2014 : Slicing can be done with Cura as well. In that case, select the 'Prusa Mendel I3' preset in cura on the Mac mini in the Machine Menu. Then export to the SD card. The machine preset can be found at the end of this guide.


The slicing software is Slic3r , they are versions for Windows, Mac and Linux. Download the latest version.

You need to install the configuration file specific to the Mendel 90. There is a configuration file for PLA and another for ABS. This file is at the bottom of this page in a .zip file.

Open the Slic3r software chose file -> load config and select the correct .ini file. This will give all the information about this specific printer.

Then simply drag and drop your .stl file

The visualisation is extremely minimalist. You see the bed from a top point of view. By default the object will be in the center. If you double click you will have a 3d view. You can rotate, scale or arrange multiple object with the tab pannels.

The final step is Export G-Code.

Transfer the .gcode file on a microSD card.

Insert the microSD card in the remote control of the printer. Use the joystick, locate your file and print it.

Basic print setting.

The Layer height 0.3mm for a rapid printing. 0.1mm is slower but more precise.

The Fill density and the fill patern are self explaining.

Option for support and raft material.

You can fine tune other parameters like the Speed of Perimeters, Infill speed and Travel speed.


Basic Filament setting, those paramenters are normally correct in the configuration files. The diameter of the filament ABS : 3.2 mm and PLA : 2.85mm. Heating PLA extruder 200° and Bed 85 ; ABS extuder 235° and Bed 100.

For pratical reason the ABS is only allowed on this printer. The changing of filament must be done carefully, enought plastic must be extruded to be sure there isn't a mix of PLA and ABS wich reacted to differents temperatures. Sadfully the plastic had jam the extruder in the previous attempt then the head has to be fully removed, cleaned and recalibrated.

The other printer settings don't change : bed size, nozzle diameter.

They are plenty of others parameters in the Expert Mode located in the Preference.


Preheat the printer with the remoter control. Choose Prepare then Preheat ABS.

AutoHome the printer after you have printed your piece. This will move all the axis in the default position, it will aslo prevent that the head is glued on your piece or on the platform. Choose on the remote control Prepare then AutoHome.

If for some reasons you must shutdown the printer, first of all, cool down the temperature of the head by Prepare then Cooldown otherwise ABS stucks in the head.

Cura preset 

If the profile for the prusa doesn't exist yet... Open "C:\Program Files (x86)\Cura_14.03\Cura\preferences.ini" and add this code at the end.

machine_name = Prusa Mendel i3
machine_type = RepRap
machine_width = 200
machine_depth = 200
machine_height = 200
machine_center_is_zero = False
machine_shape = Square
ultimaker_extruder_upgrade = False
has_heated_bed = True
gcode_flavor = RepRap (Marlin/Sprinter)
extruder_amount = 1
extruder_offset_x1 = 0.0
extruder_offset_y1 = 21.6
extruder_offset_x2 = 0.0
extruder_offset_y2 = 0.0
extruder_offset_x3 = 0.0
extruder_offset_y3 = 0.0
steps_per_e = 0
serial_port = AUTO
serial_port_auto = 
serial_baud = AUTO
serial_baud_auto = 
extruder_head_size_min_x = 0.0
extruder_head_size_min_y = 0.0
extruder_head_size_max_x = 0.0
extruder_head_size_max_y = 0.0
extruder_head_size_height = 0.0




Difficulty: ●●○○○

Last updated: 21 weeks ago