Calibration Cube

[Michi86]

Hey there,
i've got my first (half) print out of my Rostock MAX
i perform the hollow calibration cube and for the first print it looks really good i think
The edges warp a bit, but the layers and outer sides looking really good

The main problem was, that the bridge which comes after the windows of the cube doesn't print out
I've printed ABS with 250°C for the hotend and 90°C for the bed with a 0.35mm nozzle.

As you can see the long parts of the bridge comes out, but the transverse flew down and then the hotend takes the print out of its stand and off of the bed
Could that be because the hotend was too hot and because of that the material cools down too slowly? or whats the matter with the print ?

Thanks in advance

[Capt Jack]

Bridging is something I still haven't mastered.
From what I understand, you need to the bridge to cool rather quickly so that it stiffens and retracts when it attaches. I saw a really nice YouTube video where you can actually see the bridge tighten up as it is laid out.
Keep working on it by lowering you temp 5 degrees at a time. Also try adjusting the print speed.
Good luck and post your results!

[JohnStack]

Could that be because the hotend was too hot and because of that the material cools down too slowly? or whats the matter with the print ?

Thanks in advance

You're running too hot in combination with running too fast. I got a pretty solid cube at 240. Also, that small part should not curl at the edges/bottom - at all. Bring down your bed temp to 65 - 70 with a good coating of glue stick.