How can the order of prints for the first layer be adjusted?
I am printing what is essentially an open-top cube, but it has to be printed upside-down, so needs baseplate support. As I am printing in ABS, I like (need!) to use a Brim. The problem here is that the brim gets printed first, followed by the first support layer, followed by the shell first layer. This means that by the time the first layer of the shell is laid down , the brim has cooled somewhat, and is not so effective. The order that I would like to be able to specify is the support first, THEN the brim, then the shell.
RE: How can the order of prints for the first layer be adjusted?
You cant. Go open a request on github. https://github.com/prusa3d/PrusaSlicer/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc
RE: How can the order of prints for the first layer be adjusted?
As neophyl said, you can’t. But I’m also struggling to see why the particular order would make any meaningful difference?
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: How can the order of prints for the first layer be adjusted?
As neophyl said, you can’t. But I’m also struggling to see why the particular order would make any meaningful difference?
It matters on the first layer.
Printing Layer 1 in the order Brim, Support, Shell, allows a considerable time delay between finishing the Brim, and starting the Shell. In order for the Brim to be effective, I feel it should be immediately followed by the Shell. Printing Layer 1 in the order Brim, Shell, Support OR Support, Brim, Shell would achieve this. As a workaround, I have added a 'Brim' to the Model's drawing, and re-sliced it (without specifying a Brim). It is printing now, and I'll know if that worked in 5 hours!
RE: How can the order of prints for the first layer be adjusted?
@fuchsr
It doesnt make a difference. I suspect the original poster is suffering from the cleverness of the Prusa Slicer defaults. Without them attaching their saved 3mf project file for us to check settings though its impossible to say. I can take an educated guess though.
From the tone of their post I get the impression that the brim they added was not effective. They assume therefore that its something to do with the print order. With the part not sticking to it as its 'cooled down'.
However if they are using a Prusa Default then its highly likely that the Elephants foot compensation is set to 0.2mm. For many printers though this is actually too much. It has the side effect of making the brim attachment either very weak or non existent. This is because the elephants foot is not moved in along with the part perimeters. I have mine set to 0.1 even with a decent squish. Many people have reported that the brim is not actually attached to the part with a 0.2 EF.
With the project we could check these things but I suspect that is the real problem and not the print order.
As they are manually modelling in a 'brim' the Elephants foot will apply to that as its part of the model so their part should print fine.
RE: How can the order of prints for the first layer be adjusted?
I was printing a set of skrews. That goes best with "complete individual objects, on". They are small and needed brims. The head has a delicate detail printed against the bed, and so elephants foot is a problem. I have tried lower temperature, extrusion multiplier 0.95 (from 1) and cooling fan variations. When moving from successful single instance printing to a series the brims were printed nicely. When going to the first part and from there on everything started to snap off the bed.
My assumption was that printing the brim first might have given the brim time to come loose, until I found some junk on the side of the nozzle. Don't know if that junk is the result of previous over extrusion, because of low temp (making filament pull on the part), cooling fan blowing too hard on the brims or something else. The diameter of the main parts are 5 mm, printed with PC and a good translucent result. Halfway up... 5mm... the part runs free and fails on a servies of prints. Printing all layer by layer would destroy the details...I think.