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Trouble printing PLA on heated bed


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Posted · Trouble printing PLA on heated bed

Hello!

I just got a PLA kit to hook up to my ultimaker. I've installed a custom firmware, installed a 4.7k pull up resistor and set it up. Everything seems to be working from hardware part

(The kit i bought: http://www.ebay.com/itm/Heated-Bed-Kit-for-Ultimaker-Reprap-3d-Printers-MK2-PCB-Aluminium-plate-/161157442118?pt=LH_DefaultDomain_0&hash=item2585bb6a46 )

It heats fine, goes up to a 100c and down to 0 on the UltiController.

So i start to print on a glass plate, and it seem to be "dragging" the pla, when it starts extruding the edges it dosent strick so it's beeing ripped up against the extrution head.

Well after adjusting the level of the bed a little i may be able to get it to extrude better but its kinda random if it sticks or not. When it does it prints a big flat line, looks really good. Then it starts on the inner wall, and making some holes starting from the biggest hole going down. (image of the printed object: http://link.jepb.no/Vdmj)

When it lays the edge for the third circle from the bottom it dosent stick and is beeing kinda deformed. The nest 2 until the end is perfect. Then it starts filling the item from the bottom hole. It goes forward and backwards, after a few times it starts "lifting" the pla it already laid down just the last maybe 2 strokes.. and when it get to the thinnest place to fill it sticks the edge to the extruder and deforms that too!

I had it working perfectly without a heated bed, but i was really struggeling to get objects OFF, i sometimes ripped the object in half when trying to get it off the bed. So thats why i want this heated bed.

Yesterday i just "let it print" even if it was deformed. After it was done it cooled down and the items was loose :p So good improvement.

But anyone got any tip for me?

Ive tried:

- Less distance from bed to extruder, making the line so thin its transparent. Not good.

- More distance making the line more "square ish" not sticking - at all!

- Middle thing making it flat on the bed, sticks good some places, less good other places.

- Starting off with 85deg, no luck

 

 

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