Calibration cube looks kind of like a frosted mini wheat

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Calibration cube looks kind of like a frosted mini wheat

Postby habitmelon » 2013-Sep-Fri-12-Sep

We finished assembling our Printrbot Plus v2, all the axes are moving, and we can print a cube (15mm)^3, but I can see the filament (picture attached)

The temperature is 190°C, the bed is 70°C, I am thinking I should heat it up.

Does anyone recognize this 'stringy' effect, is it just not getting hot enough? What parameters should I adjust to get rid of or reduce this?
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Calibration cube looks kind of like a frosted mini wheat

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Re: Calibration cube looks kind of like a frosted mini wheat

Postby DJNOS1978 » 2013-Sep-Fri-12-Sep

Eat it. Sorry but I had to.
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Re: Calibration cube looks kind of like a frosted mini wheat

Postby Tdeagan » 2013-Sep-Fri-14-Sep

Could be a variety of things, the first thing I'd check is the Extruder ESteps value. There are numerous posts and instructions for calibrating the extruder, so I won't repeat them here. But that's essential. Calibrating the X and Y axes may make a difference as well.

The settings in your slicer could be making a difference, what do you have the layer height set to?

One other thing could be that you're missing steps (which could cause the spaghetti at the top,) which might be related to the amps available to each motor. The Printrboard has trim pots for each axis. Have you adjusted them at all? Are the motors running cold or hot?

I've never needed to run my PLA over 185C to get good results, so I wouldn't think you'd need to push past 190C.

It is worth making sure you're getting evenly fed filament, check the hob to make sure it's grooves are clean, if not, clean that up.

Good luck!
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(optional Dual Extrusion) Printrbot Plus V1 [3/2013]
bed stabilizers, bed levelers, Y & X belt tensioners,
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Re: Calibration cube looks kind of like a frosted mini wheat

Postby habitmelon » 2013-Sep-Fri-17-Sep

Layer height is set to 0.3mm, do you have any recommended tutorials for calibrating the extruder?
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Re: Calibration cube looks kind of like a frosted mini wheat

Postby mdfast1 » 2013-Sep-Fri-18-Sep

Read the getting started guide then report back http://printrbot.com/wp-content/uploads/2013/06/Getting-Started-Guide.pdf . This is most likely an extruder calibration issue. Or not setting the nozzle size/filament diamater correctly in the slicer you are using.
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Re: Calibration cube looks kind of like a frosted mini wheat

Postby RetireeJay » 2013-Sep-Fri-20-Sep

It also looks like maybe your Z calibration is off. The layers look so widely separated. Are your z threaded rods the stock 5/16" - 18? If so, your z calibration should be set to something near 2267.72 steps per mm.

What are the dimensions of the finished "cube"?
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