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Getting started with 3D printing on the Ultimakers

The workflow in any prototyping using 3D printers is:

  1. Retrieving/creating a 3D model: You can fetch files from creator spaces such as Thingiverse or model them your self, using a CAD tool such as Fusion360 or SolidWorks.
  2. Generate paths for the 3D printer: We normally use Cura for slicing.
  3. Last preperations: Make sure that the build plate is clean, the machine is calibrated, and when you start your print please make sure the first layer turns out as expected.

Cura

The official guideline from the manufacturer can be found here. Note that we have our own additional guidelines to increase the life expectancy of the printers.

Software setup

Always make sure you are using the correct printer, in this case Crealty Ender 3, in Cura. Moreover we recommend the following setup:

Quality: Normal (layer height) (0.15) Infill: Density (<=30%) Material: Printing temp (200), Build plate (60). Diameter (1.75), Flow (100), optional(Speed: Print speed(50), Travel speed(120), Print acc.(3000), Travel acc.(4000) Build plate adhesion: Brim(true))

Version

As a rule of thumb, we recommend using the latest version of Cura.

Filament

We only use filament from Polymaker, which is due to the high reliability and ease of use. The main printing material we use in the labs is PLA with Ø:1.75 mm dimension. The material needs to be set up correctly in the printers UI.

Hardware setup

The standard nozzle size is .4 mm.

Before pressing start

Make sure the build plate is clean. Use lukewarm flowing water to get rid of leftover materials, glue, or dirt. Please use the HC toilet and not the sink in the kitchen. After starting the print, make sure that the first layer turns out as expected. Most errors arise during the first layer of the print job.

Calibration

Follow these instrucions [2]:

Fig. 1. Calibration using a sheet of paper.[1]
  1. Position Hotend Tip over Leveling Knob
  2. Completely lower Hotend Tip towards bed
  3. Place a piece of paper under the Hotend Tip. See Figure 1.
  4. Tighten knob until it slightly catches the paper
  5. Repeat with other 3 sections of the bed
  6. Test center of bed to confirm a completely flat bed. Raise or lower other 4 corners and re-level if necessary

Note: Make sure there is no extra pressure on the bed. Any pressure on the bed will cause incorrect leveling due to the compression of the springs on the leveling screws.

Change filament

Make sure to only use the Polymaker PLA 1.75mm filament on the Ender printers. If you need to use something else, contact faculty. We will dispose any other filament than the specified material.

Fig. 2. Pressing the clamp by the extruder.
  1. Move hot-end to Home- position:
    1. Prepare.
    2. Auto home.
  2. Heat nozzle:
    1. Control
    2. Temperature
    3. Nozzle
    4. Set to 200C
  3. Pull out the current filament while pressing the clamp by the extruder. See Figure 2.
  4. Put the new filament spool in the machine.
  5. Insert the new filament into the extruder and purge det hot-end. Remember to keep the nozzle at 200C.
  6. Set the nozzle temperature to 0C

When the print job is finished

When the print is finished clean the plate again. If the object is stuck, you may use a scraping tool. However, make sure you don't harm the plate. Hence use scraping tools with care.

Our Enders

We have 12 Enders in total in our printer rack at 4321.


The Enders @ Robin
Printer name Responsable (username)
ada marierei
alan haakoht
albert magnuhoe
bjarne martolse
elon mathiani
isaac mhtveter
larry nanettel
leslie nqabbas
linus oleeskj
nikola sebastto
sergey tisland
steve vegartho

Errors

If a print goes wrong, do the accordingly:

  1. Check setup in Cura and on the printer.
  2. Rewash the bed level.
  3. Calibrate bed level.

If this does not help, please notify the group-teacher or the engineer.

Clog

Clogging of the nozzle typically occurs when the workpiece has tilted due to overhang, wrong settings in Cura, or wrong filament type. A solution to clogged nozzle is using the Atomic Method

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