Sequential printing in 2.9.1 caused printer crash on first try
Yesterday I downloaded PS 2.9.1 and sliced my first model for sequential printing. I prepared two Harry Potter wizard's wands for my kids, to be printed using different extruders because they wanted them in different colors. After setting PS to complete individual objects, I clicked arrange and the wands were arranged far apart on the print bed (one at the front, one at the back), where normally PS would have put them next to each other. Great, I thought, it's really doing what it is supposed to.
I left the printer to it and it managed to print the raft of the front want and the entire back wand, both in the filament I had assigned to the back wand. Then it must have moved the bed up to the zero position and when it went to change extruders, the print head crashed into the finished back print. I wasn't observing at the time, but when I got to the printer, docked all extruders and told it to resume, it promptly crashed again even before being able to pick up the extruder, since the bed was all the way up in the zero position.
So it seems to me PS correctly told the printer to print the back wand first (except for the raft for the front wand, which seems to also have been printed along with the first layers of the back wand), but then moved the bed up before changing extruders, which caused it to crash. Did I do something wrong, or is this still a bug in PS? I think if it just kept the bed where it was when it finished the back wand print and changed the extruders, then printing the front wand would have proceeded without a hitch. If it helps, I have attached the 3mf file.
RE: Sequential printing in 2.9.1 caused printer crash on first try
So... Um... Based on context clues you are printing on an XL? (You never mentioned which printer...)
Also, due to a quirk of this forum backend, if you try to upload a 3mf file it will be silently deleted. You will need to encapsulate the file into a .zip file for the forum software to accept it (even though 3mf files are technically zip files already).
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RE: Sequential printing in 2.9.1 caused printer crash on first try
I haven't used it on the new release of PS, but I can tell you from experience that if you have filament changes on sequential printing, the chances of failure are large because you don't really know the path the print head is going to take to change tools, hence leading to crashes.
Stick to single material sequential printing imo. Also make sure to set your first layer and subsequent layer temps the same or you may have adhesion issues on any print after the first one.
RE: Sequential printing in 2.9.1 caused printer crash on first try
I wouldn't dream of using sequential printing with my XL unless it is one extruder only. As you witnessed, the docking/undocking process is likely to cause havoc. In particular as you can actually override which extruder is used on the printer itself, so slicer has really no idea where the extruder(s) is(are) really going to be. IMHO, in practice sequential printing and material/color changes are mutually exclusive
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE:
just my opinion, the software was crap! in the alpha's in the beta's, in the RC's and lol in the final releases...... oh my
the new software is complete crap, nothing good has come from it. good luck to the personas that try to support prusas release, however they have not been good for a very long period of time "years" 2.4.2 was the actual last good version. since then prusa has only done what they felt needed t do done to sell printers. Nothing has been done to help the community, I would be willing to fight about this, should they not agree, however they have a way of banning people that don't agree. So this might have to happen on some other forum that prusa doesn't control.
Good luck folks, for those of you that cant see this, I'm sorry your believes are miss placed.
RE: Sequential printing in 2.9.1 caused printer crash on first try
Don't get me wrong, you can definitely sequentially print, I have done it successfully. I have a few very tightly toleranced parts if printed as a group won't fit, but printed individually will. This is because the amount of cooling time between layers affects part size when your dealing with tight fits. These parts in particular are a ball and socket type fit and if printed as a group they end up too small. This is because the previous layer is allowed to cool and shrink before the next layer. This doesn't happen when printed individually because the next layer is immediately printed.
So except for special circumstances I haven't found much use for sequential printing, unless the parts are shorter than the gantry. I also never had the software place the parts for me, I always manually placed them because that are always taller than the gantry and could easily be crashed into if you had clearances between parts wrong.