Temperature Slowdown Logic

[dennisjm]

I have a part that has a couple pegs sticking up. They're pretty small. If I print slow enough they print fine but at default speeds they get messed up.

So usually in cases like this the temperature slowdown code is enough to slow those layers down. The problem is when I also have supports the software no longer detects that as a case where it should go slower since the supports take up enough time on the layer it doesn't trigger the case.

Anyone know a good way to work around this? It might be time to try a 2nd process but then the supports would print really slow too on those layers which isn't really necessary but I might have to live with it for this part if there isn't a better way.

[jimc]

just adjust the layer time setting to make it long enough to engage during each layer.

[dennisjm]

just adjust the layer time setting to make it long enough to engage during each layer.

It takes a long time to print the supports on that layer so pretty much no matter what I put it to it won't slow down much. If I raise it so much it does it'll slow the print down to the max allowed slow down for the whole print.

[jimc]

well if you have support being printed and the layer is taking a long time then there is no real reason to slow it down further. it should have plenty of cooling time. im not a real fan of slowing down a print for cooling because it just keeps the nozzle over the fine details soaking them with heat. i have had better luck just adding a skirt the height of the model or printing the model with other models

[dennisjm]

Perhaps I'm not describing the problem right. The problem isn't that the layer is printing too fast. The layer does take a long time. It's that the particular small feature prints too fast. It isn't even a cooling problem. It's an accuracy problem. Usually I get around this with the setting to print outline speed slower but for some reason that doesn't seem to be working. I think this may just be a problem with the way I'm printing the model or the model itself. I'm going to try just widening the feature slightly so it isn't so small and also maybe I'll just try splitting the process and slowing down that particular few layers.

[jimc]

oh i see. i thought it was getting too hot. only thing i can think of really is set up 2 processes and reduce the print speed when you get to those areas. or beef up the model if thats at all possible. adding in a little vertical lift may help if the features are getting knocked over during a rapid movement.

[dennisjm]

Knocking over is part of the issue. I think I'm having two problems
* I'm not getting a great stick on these parts and I haven't figured out if that's temperature or speed related. That causes more problem the faster they print.
* I think I need to tune my retract/coast settings. I see the parts getting moved when the nozzle finishes printing them. Related to the first issue as well of course. Have to keep fooling around with it I guess.