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Heated bed upgrade, first layer does not stick properly

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So I installed the heated bed kit on my ultimaker original.

The problem is that the first layer does not stick properly.

I use colorfab XT

nozzle: 250 °C

heated bed: 70 °C

speed 50 mm/s

Tiny blobs appear where the layer does not stick, at the next layer the nozzle digs into them and sometimes pushes the print off

I use the glue stick and the bed is properly leveled, the cooling fan not turned on at this point

anyone have a clue whats the problem ?


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I can't remember the magic numbers but I think hotter on the bed helps like 80c - 85. Then reduce it some to like 75 after the first layer.

For me, when printing XT, hairspray really helps. I just spray it on a paper towel with the nozzle up close so it pools a little and then I swipe it over the glass plate.


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