Hey Guys.

I have a question.

What are these Lines on marvin’s body?

I printed him with the prusa i3 mk2 at 100 microns

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A pic would help.

Nevermind this post… I forgot the pictures…

Yea I know but I forgot to put them on here.:stuck_out_tongue:

I’ll post the pictures when this post gets approved

No worries!!

Just published the photos. :slight_smile:

Ok, what are the settings? Is this ABS? What are your temps and speeds?

My first thought is speed. I think I printed him around 1200mm/min.

One thing that is good to try is print 3 or 4 at a time.

Using PLA at 210ºC (this gave me the best results on my other prints)

The settings on S3D are these:

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Hi @mx20100 I’d expect a much better Marvin than that on the i3 at 100microns so something is wrong somewhere :slight_smile:

How stable is the machine? Is it on a good solid surface? Speed looks OK - 30mm/s is about as low as I’d go for a print like this (although you could always go lower). What cooling are you using? PLA needs a fan and for Marvin I’d go 100% so check that.

As @wirlybird said, printing 2 or more at a time usually helps with Marvin (and other small parts sometimes) so I’d give that a go (just load another Marvin into S3D and press “Centre and Arrange” or use the Duplicate option).

Hey cobnut.

My i3 is on the anti vibration feet from http://www.thingiverse.com/thing:1707045

I am using the stock cooler but I am using it at 50% because it is a bit to strong so it cools of the nozzle quite a bit…

But I’ll give it a go :slight_smile:

Thanks!

Have you done the Marvin that is on the SD card?

I printed that one and it was near perfect. Reason I ask is they have tweaked it to print great. That could give an indication. If it prints great then it is just settings otherwise might need some hardware adjusting.

I might also try at .2 layer first.

If I get time I can try one using S3D on mine and see how it goes to check settings.

I’ll try that and if that does not work I’ll tell you :slight_smile:

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Hey Wirlybird and cobnut,

I have just printed the marvin from the sd card. I looks better. I printed one with and without vibration dampers. (the one with the brim is without the dampers)

Hi!

This looks like uneven extrusion. Prusa has an E3D V6 extruder, and it is known to have problems with PLA extrusion if the temperature is to high relative to the print speed. The filament gets warmed up in the coldend and offers resistance to extrusion, causing uneven flow rate. The small 30mm loud fan does not do a very good job at cooling the heatsink.

I suggest reducing the temperature to 190 at most, for 100 micron layers.

The alternative solution could be disassembling the extruder and adding generous amounts of thermal compound.

Thanks kres! I’ll try lowering the temp a bit at a time and show you the results. BTW where do I put the thermal compound on?

Great :slight_smile:

Thermal compound goes on the heat-break, a steel pipe which is screwed into the aluminum heat sink on one end and heater block with the nozzle on the opposite end. There is a slight gap between sink and the pipe, which makes it difficult for heat to dissipate and keep the filament cool. Thermal compound serves to fix that.

You have to remove the filament and remove the extruder (don’t have to disconnect any cables). Then simply unscrew the heat sink from the rest, apply the compound on the threads of the heat break and screw it back in.

Alright thanks! I’ll try that! :slight_smile:

also check if E3D is assembled right and its not a fake one

a real E3D when assembled right should not get warm at the cold end

maybe even insert a cork disc to insulate it. at least heat radiation as a parameter is keept out of the loop