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Bulge/Blob at top of prints with small cone like tips trouble :/

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Hey everyone!

I have an Ultimaker V1 and I absolutely love it. I do however have some difficulties with the settings to get my prints to come out better when I print object with a cone like tip.

Basically, whenever any of my designs have a cone like tip on top, it prints it like a blob or bulge. The rest of the print looks great.

My settings:

Layer Height: 0.1

Shell thickness: 0.8

Bottom thickness: 2

Fill density: 30%

Print Speed: 45 mm/s

Printing Temperature ©: 235

Flow rate: 100%

It seems like whenever the machine begins to make really small circles, squares, or any shape thats small, it moves too fast for the filament coming out to stick to the model.

Can I slow this down without making changes to the rest of the model?

Here's what it looks like:

Ultimaker traffic cone


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Yeah, this is a really simple issue to solve.

As you know, the nozzle is really hot. When it stays in a small area for a long time, the plastic beneath gets too hot and melts. So what you need to do is give it time to cool down.

There are a couple of things you can do:

1. Print two at a time. This way it has time to cool while the head moves to the other model.

2. In the settings you can give it a "minimal time per layer" and enable "cool head lift" which will move the heated head away from the print for a set amount of time, thus giving it time to cool.

Hope this helps :)


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Awesome! Thanks for the input. I didn't think about that.

however, I do have some parts that are pretty large and don't have enough space to print two at the same time. Maybe i can add a couple of thin post to the side of the part so the head can travel somewhere else so my main part prints.

I will try this and post pictures of the updates.

Thank you again!


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