Right now standart profile in snaporce app has 45 mm^3 
And the dragon that comes âout of the boxâ for printing has prime_volume 40mm^3 / prime_tower_width = 40 in profille.
I ended up with 22 grams of dragon and 21 grams of tower
I feel like the dragon test print was sliced on a way to not fail, so a prime tower equal in weight was used. I think Bambu does something similar with their speed benchy test slice.
The option is in the filament profle. Try there. A safe percent should be between 10-15mm3.
Yeah. We did a lot of testing at 15 mm^3, then the final profiles were way more conservative and seem crazy aggressive for other brands of filament. Itâs, um⌠A little bonkers to me and kind of undermines the filament savings the U1 boasts about.
Easy enough to turn it back down at least!
Oh sorry, didnât see this. For a material the minimum should be under the Multimaterial settings in the material profile, I think? And the requested value is in print settings under Multimaterial.
And itâs trial and error. Practically it should be kind of constant, based on some small volume thatâs close to the melt zone while parked, and what it takes for a material pressure to stabilize again when it resumes. The U1 uses a rather healthy retraction for most materials when parked though, so I would expect it to be mostly the latter.
Personally I think 15 mm^3 is fine certainly when Iâve printed PLA or ASA at 0.2mm or 0.16mm layer heights. The area printed per layer increases automatically with lower layer height to get an equal volume purged.
If you find certain materials arenât extruding cleanly at first after tool changes, the minimum or nominal value can be increased again.
Some PLA profiles apparently have a minimum set of 60 though, and itâs hard for me to believe thatâs really necessary.
its not. I dropped it to 15 and now i get specs. I torture tested with a white body , red scales and bright green eyes. Im at 25mm wide and /15mm3 and its still specs. Dropped the temp from 220 to 215 helped a bit, But we NEED to be able to wipe in the tower. This is just from contamination.
Ive printed about 50 tests now and 15 does not cut it at stock settings, With a white body i get contamination, doesnt matter what brand of material . Ive tred 4 rolls of red and 5 green. ALL get some contamination with it this low on a white body⌠worst caseâŚ. Im still working on this⌠i wouldnt say 15mm3 is good enough to lock in. MAYBE if we could force a wipe move in the tower at the end of the prime moves it would help but we cant.
@Snapmaker: in the SnOrca menus (English) âminimalâ and âmaximalâ (which donât make sense) should be replaced with âminimumâ and âmaximumâ.
Have you tried also enabling a Small Perimeter threshold? That is, if dots are coming from tiny extrusions.
A 5 mm threshold and 50 mm/s limit for small perimeters, and I havenât had any trouble at all with smaller primes on PLA, except with some wet filament.
This is like driving a Toyota Prius and complaining about the gas mileage. No printer that exists is âzero wasteâ even a resin printer has waste.
Something I had not expected, is that when I lowered the prime volume and width of the prime tower, it shaved a lot of time off the total print time! Around 13h20m to 11h48m
Thanks for sharing your options. Iâm going to try these on my next print.
(and changing the prime tower filament color to the color thatâs most present in the printed model itself lowered the print time to 8h35m which was another substantial decrease!).
Finding a way to get rid of the purge tower is the ultimate solution.
The only way to do that is to prime and wipe the nozzle in the actual build, somewhere internal that doesnât matter (infill). Even if the nozzles prime when parked (eg with the Sidecar mod), they still need wiping before committing to critical print.
What about layers in the print where there is no safe place to do a prime and wipe? If there are any head swaps in those layers, there is no choice than to have a prime tower. Overall, itâs a lot easier not to have to think about it and keep a prime tower regardless.
Only a single-head print doesnât need a prime tower.
Today I discovered that purging into infill doesnât work correctly when also printing with 100% infill (achieved by raising the walls amount to the point where there is no infill left to infill as this gives a better result than simply 100% infilling).
I havenât been able to find a good way to get rid of the purge tower so far. Sometimes purge into infill works alright though.
Why do you want 100% infill? Thatâs just a waste of material.
It was a relatively thin model that I wanted to have some weight to it. As it was thin I couldnât use scrap bolts to fill it with some weight and I had to resort to doing a 100% infill print. In this project it was all about experience and I personally believe the weight of the object was important to get as high as possible. I usually do not go beyond 3 walls unless itâs a load bearing part, then I up it to 5 or 6. Infill is usually around 15% for me in most cases, unless itâs a load bearing part, then it goes to 20~25% but more walls is usually more important than high infill. Iâm a fan of cubic.
On top of that it was a fun exercise and nice to try and make it work without running into flowrate issues and of course I found some other interesting insights. The print ended up perfectly printed so Iâm very happy with how the experiment went and the person who first saw it today immediately asked if they could keep it to which I happily agreed
Yes OK, but I donât think thatâs typical. Solid prints can be problematic.