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doc:tools:3d_printers:prusa

This is the Process for printing:

RepRap Prusa HowTo

Before Starting Workstation

Check Station

Clean up any plastic scraps, to ensure that the station remains clean

Start Laptop

Turn On Power

Behind the laptop is the “Extruder and Heater Bed Power supply” switch, as well as a (12V ?) power supply for the stepper controllers.

Turn both power supply on. (The LCD may look on, but they are powered by usb)

Next is to turn the laptop on.

Setting up a print

(You can technically import stl file into proterface. But it is better to do it in a slicer program first as a gcode, and import to proterface as a gcode instead.)

Recall that the process is

.STL model –> slicer to gcode –> Pronterface printer program

slice stl model

slic3r program in this laptop is already preconfigered unless stated otherwise, with the right settings for slicing the model for the 3d printer.

In the desktop there is a shortcut for “slic3r”, open it.

Then drag and drop the stl file.

Then click on export G-code button.

Starting up a print

WARNING: Quite a lot of people when using this machine often just jumps to the “Print” button after loading their G-Code. While you can sometimes get away with this. It will eventally end up wasting your time, if the extruder head is mis-aligned. To account for this, you really should take the time to follow the preperation steps here.

It is critical that you always realign the xyz position to each home first at each axis seperately to check for any potential mecanical crash.

Homing Test

A homing test (As opposed to a calibration process), is there to ensure that the extruder head will home and resets it's coordinate position correctly. (This is because the printer works on an open loop principle, there is no positional feed back) to account for any misalignment.)

Home X

Click on the button with the symbol of a house next to the X button.

Observe the moment of the extruder in the X axis as it moves away and then towards the stop limit switch of the extruder.

Home Y

Click on the button with the symbol of a house next to the Y button.

Observe the moment of the extruder in the X axis as it moves away and then towards the stop limit switch of the extruder.

Observe the LED on the optical break limit switch

Home Z

Click on the button with the symbol of a house next to the Z button.

Observe the moment of the extruder in the X axis as it moves away and then towards the stop limit switch of the extruder.

Home XYZ

Not recommended since you can't as easily observe all xyz axis moving at the same time.

prepare the beds

To ensure proper adhesion of the filament to the beds. Please clean bed with some windex.

Test Extruder and preheating

Click on the “Set” button next to both the “Heat” and the “Bed” temperature setting to activate the heater for the extruder and bed.

To test filament, after the extruder has heated up (usually approx 235 deg), you should test the filament extruder (grab a tweezer first) and click on the extrude button. This will perform a test extrusion of plastic. Use the tweezer to pull the test plastic out and keep the head clean.

Ready to Print?

If all the prep work is done. Then you can proceed with the print.

Click “Load File”, and then click “print” button.

During a print

Most printing problems occour during the first few minutes of the prints. During this first few minute, you should have a tweezer ready to pull off any stray plastic that emerges from the print head. (They have the potential to mess up the print

Request: Please do not leave this station unattended, during an active print sesson. This is because during a print, anything can go wrong, and somebdy will need to be there to cancle the print

Request: Please ensure that the duration of the print does not exceed the duration the club opening hours.

Note: You generally don't want the fan facing the bed heater to be on. It is mostly used to cool the bed after a print.

Fail Modes to Observe for

Be aware of these modes of failing:

* Tangled filament. This is since a tangled filament at the bobbin (the roll of plastic rope above the printer), will essentally act as a climbing rope for the extruder (or at least the 3d printer will attempt to at it's own destruction.)

* Delamination: Where an object is push away by the extruder, because the print doesnt adhere to the bed well.

In either of these cases, you want to hit the off button in the Proterface as quickly as you can. Else, pull the power plug.

After a print

People have been forgetting to clean up after their print. This is annoying to others. Please clean up scrap plastic and place it in the bin at least.

Also at the end of each day. Please clear out the bins.

Replacing build tape

The tape can be found on a large roll above the 3d printers. Frst remove the old tape by peeling it off. Once removed use soapy water on the build plate. Once soapy replace the tape and cut to size.

doc/tools/3d_printers/prusa.txt · Last modified: 2015/05/18 18:26 by 123.243.127.172