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Preparations

Attention: Running the reprap with wrong parameters may inflict serious damage to the extruder or the base plate!

To get reliable prints you have to find out the correct parameters for your extruder and material. This includes the distance from the base plate, temperature and speed.

When running the extruder at a too low temperature may result in pressure building up inside the extruder. This can damage the ptfe tube beyond repair. You have to recalibrate the temperature settings for every new material you are using. Even the same type of material on different rolls may have different parameters.

To get some initial values to work with follow the instructions which can be found at the blog from bits from bytes.

See http://rapmanv3.blogspot.com/2009/05/extruder.html and http://rapmanv3.blogspot.com/2009/05/printing.html

A short summary: Adjust the bed according to the instructions. When laying out the bed the nozzle should press the extruded plastic a bit onto the bed so it sticks good.

Using a sheet of paper is a good method to test the distance of the extruder head to the table. The head should move freely above the paper. If the head is too close the the table, the head can clog which results eventually in disaster. (ABS melting into the table, ptfe-tube expands and rips)

If you hear a clicking noise from the feeder assembly, don't just blindly tighten the screws, maybe something is wrong, either the temperature is too low, or the feeding speed is to high or the head is too close to the table.

To get a initial temperature to run with heat the extruder to the desired value. Then try to feed the plastic by hand. If you can produce some nice filament by hand fasten the clamps pressing the plastic to the shaft. We had some success using ABS at 240°C.

If you set a temperature that is too low you might damage the extruder by building up to much pressure. If you set a to high temperature the ptfe may fail.

Check if you can restart the machine reliably from a cold state.

Now you can try your first print which will be a “schnaps glas” ;)

The raft for the minimug is very strong. The first layer is printed out at 1/4 the normal speed producing a very thick filament. The next layers are printed at a faster speed.

Printed objects and configurations

Date Name Object Description Modeler/CAD weight Link to Thingiverse Configuration changes Pictures Comments Copies
12.06.2009 key_export.bfb Handcuff Key / Vertical Blender ~3g n/a Standard n/a Extruder much too fast ⇒ not enough time for layer to get hard 1
12.06.2009 key_export.bfb Handcuff Key / Vertical Blender ~3g n/a Extruder speed: 8mm/s n/a slower extrusion, but forgot to set PWM feed accordingly ⇒ extruder tried to feed too much 1
12.06.2009 key_export.bfb Handcuff Key / Vertical Blender ~3g n/a Extruder speed: 8mm/s, Flowrate PWM: 180 n/a Quite good print. Only “beard” of key is not very hard 1
12.06.2009 meter_key_export.bfb Utility Meter Key n/a n/a http://www.thingiverse.com/thing:198 Standard http://www.thingiverse.com/thing:198 Good print 3
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