My First printing fail. Need some pointers

After several successfull prints I had my first failure today.

I printed the following thing:

And during printing iit came loose of the heated bed and messed up the result.

There are a few things that might be interesting factors:

1: I had to rotate the model 45 degrees to fit it on the bed. This caused the infil to line up with the model. Normally its at a 45 degree angle to the model.
2: The room cooled down a lot during printing. And the heater in de back of the room switched on. This might have caused hot air to reach the model during printing.
3: The reason it came loose is because the model bottom has curled up. This happened in the later stage of printing. (see included photos)
4: It failed before the last 20 passes of the outer ring. And then made a wonky stack of hay out of the chimney. Thee top of the boat (with lego studs) was printed perfectly. Lego fits.


So, my question: Why did the model deform after so much printing time. Was it the heat from the heater. Was it the angle of the inner support structure. Did I not say enough nice words to my snapmaker… Any pointers would be great. I’m eager to learn.

Here is the settings JSON:

{"version":1,"name":"Modified - Normal Quality",

I may have answered my own question all-ready. The two things I find interesting is.

Nozzle height. It might be too low. I recalibrated before this print. And I read others push the nozzle up one step after calibration.

Bed temperature. I may need to lower the temperature once the bottom is fully printed.

Before I try a new run I’ll see if anyone here has some more suggestions.

This is your main problem, some materials need more temperature stability than others.
The best would to have an enclosure, so cold air doesn’t come to your print.
An open window could destroy all.
The issue is called warping.


I don’t have an enclosure, and I sometimes see parts curl off the bed just from turning on a ceiling fan or opening the window. For large parts, it’s only been partial, which causes some minor cosmetic issues on the bottom. I’m surprised you got such a large part to completely detach.

A brim or raft would help with the curling, but it won’t prevent it entirely. I generally print my first layer with the bed and nozzle 10ºC warmer. It helped me with bed adhesion early on, while I was still dialing in my calibration.

A pile of spaghetti string is pretty common after a part detaches. The printer doesn’t know that the part isn’t in the right position, so it continues to push filament out into empty air. That filament dangles until it happens to connect with something. This can be a challenge when printing slender spires, esp. with temperate changes.