First Layer Speed Doesn't Track Setting [updated]

[cssmythe3]

The First Layer Speed adjustment on the Layer tab isn't working as advertised.

In the attached file, I have the default printing speed set to 2500 mm/min, and the First Layer Speed set to only 1%.

When you preview the G-Code, the SECOND layer prints at 2500 mm/min, but the first layer is shown to print around 1800 mm/min when it should be 25mm/min.

More importantly, when I run the code, the first layer prints at 1800 mm/min.

Is there some 'minimum printing speed parameter' that I don't know about?

-Chuck
Flailing in NYC

PS - I actually ATTACHED the file.

[dorsai3d]

For whatever reason, the cooling maximum slowdown defines the minimum speed that any override will slow down to. So if you lower your cooling speed override to 1% and it will slow down.

[cssmythe3]

For whatever reason, the cooling maximum slowdown defines the minimum speed that any override will slow down to. So if you lower your cooling speed override to 1% and it will slow down.

Really? That is super weird. Well I just went to COOLING > SPEED OVERIDES > ALLOW SPEED REDUCTIONS DOWN TO and changed it to 1% and it totally worked. You are a genius.

[dorsai3d]

I spent a while banging my head against a wall figuring that one out. No idea why it works that way, it seems like it's probably an overzealously applied programmatic limit.

[dkightley]

Do you really want your first layer to take three and a half days to print????

If you have a first layer issue, then this sort of drastic action may not be the best way of resolving it! Or are you trying to take us as fools by quoting a rediculous value?

[dorsai3d]

Doug, I figure it's a change to make it very obvious whether or not the change is having any effect, rather than actually wanting to take 85 hours to print the first layer. I do similar things sometimes when trying to figure out how some setting interacts with other things.

[dkightley]

That's okay.....just checking, and ensuring its noted that the figure you stated was not a real value.

I can just imagine someone reading the thread and thinking that a value of 1% is a sensible value...and they try it and then complain about their nozzle freezing on the first layer!!