Retraction settings for trouble filament

Bambu Lab X1 Series Troubleshooting
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All over the last 18 months printing has been perfect no issues at all, but with a certain brand of Filament Eryone Silk Rainbow we are seeing many clogs across the farm of printers. Printers are X1 P1 and A1. As discussed previously we have tried varied Temps from 220 up to 235 and more often than not the filament will print fine at first then eventually either print in the air (clogged) or A1s will moan about flow. I actually caught it today clicking the A1 extruder i upped the temp 5 degrees and off it went but eventually just printed AIR. Now i cant pinpoint why its doing this out of 5 rolls this far of a batch of 40. Some print good some dont. Now this isnt a dig at Eryone Aaron is helping behind the scenes but i wanted to ask a technical question

Last year i ran the same Filament brand through the printers 400 rolls Candy Universe and Forest without a hitch, this year no so good. We have tried Temps Flow New Hot Ends Extruders but nothing works. At present its printing on my old Prusa mk3s and i will report back if that also clogs if and when it does.

I print generic Silk PLA profile 7.5 VFR at 220 or 225 i have tried higher but it can cause the model to melt.

My question is regarding retraction there are settings defined by Bambu of what the retraction should be, but im finding that more often than not if it gets stuck it grinds through the filament due to the blockage. this happens across all models of our bambu farm. Other filament from the likes of Jayo and Geetech Sunlu etc work without a hitch. i did see a lot of reddit on this topic people having the same issues

Could a change in retraction help and if so has anybody got any tests or successful changes to the stock profile (overrides) to cater for other problem rolls such as wood glow in the dark they may have had issues with. Settings that override the printer specific to your filament. What if anything should i change for a possible test and better experience. The only thing i can see on the Generic TAB is it has a 0.5mm override on the retraction as opposed to Bambus silk which doesnt have an override. Im pretty sure we tried both.

Many thanks

P.S Yes i have dried it to 18%

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Did you ever find the answer to this? I’m having the same problem with printing triple and dual silk from Eryone on my A1. It gets about half way through a print and starts printing air. nothing worse than getting a notice that the print is complete and find it half done. I have not changes the VFR, or anything else other than the temperature (220c first layer to 230c other layers) I print silk slow from 40-60mm/s first layer outer wall. and around 80-100mm/s outer wall speed other layers model depending. I use 0.16 layer height generally. I’m fairly new to this so any advice will help. I have googled some ranges for some settings but can’t find anything on retraction.
Thanks

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I found that for SILK filament, drop down to 190 degrees to prevent stringing using retraction. It hates heat, as it ooze out easier than other filaments.
Also slow down speeds. 220-235 is waaaay too hot for silk filament.
Even then you need a retraction of about 1.2mm-2mm

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