I know what the issue is for the overload in my case, the filament I am using has a rougher texture (eSun PLA Luminous Rainbow). As such, when it hits the edge of the spool, it binds and causes the overload.
I feel there is an easy software fix to this based on my observations. If the error occurs, instead of doing a retraction and erroring out, the AMS could roll the spool 1/16th or 1/8th forward, and try again. That is what I do. I hit start again with the lid up. When it finally gets to the jam, I just move the roll forward a little and it unbinds.
I have another UV reactive PLA that does the same thing. It is annoying as heck. It took me 2 days to finish a print as I was not sitting on top of it to advance it, so sat there a bunch. I think I cleared it about 30 times. This is a new spool, so it is not an underweight issue. Just friction.
Its a distinct possibility its not compatible to the AMS as its going to cause these and accelerated wear in the feed/hub/PTFE. Recommend the external spool for filaments like this.
Maybe on the feed tube, but it is the mechanical bind at the edge of the spool where the filament crosses itself that is the source of the issue. While they use cardboard spools, eSun has better results when searching for AMS incompatibility. eSun’s basic PLA is smooth. The UV reactive feels like 360-600 grit sandpaper.
I think I will print a re-spooler and try loading it on a Bambu spool. But man, if it would just roll a little (which is minimal slack), it would undo itself.
I use all sorts of materials in mine, but I do respool (Pastamatic ftw) so it takes that element out. I have seen some wear, hence the warning it will cause odd issues which may catch you out. Just respooling my latest order, the wood ABS looks fun but I know its gonna hurt.
PS. have you dried it? Some PLA gets easier to use and less stiff after a run through some heat.
Hi
I’m also having this issue. Mainly slots 1+4. Logged a support ticket yesterday and the responded today which surprised me. Their answer to resolve the issue was to give me a link to a Wiki page I had already researched for possible fixes. Everything they suggest I already tried.
Feeder funnels are perfect no damage. Dismantled AMS and found the AMS assist motor is overheating.Too hot to even touch. Turning the motor to the AMS hub manually filament passes through without issue on all 4.
I replaced the PTFE tubes on both slots 1+4 even though they had no sign of wear. Also replaced the one from the rear of the AMS as the filament only feeds part of the way down. Still doesn’t work.
Anyone with more experience have any ideas ?
Is it happening at the edges? That is where mine happens and it is a stiction problem with the filament catching on the next loop on the spool. Manufacturing-wise, their spooling machine is not running an extra rotation, so the edge loop is below the next loop. With the rough material it catches. I could possible solve this by putting a feeder section that was 90 degrees to the spool. That way it pulls off straight instead of a tangential angle. No room in the case for that. If the feed tube had an extension available, maybe. But if it would just on the overload message roll the spool just a couple of centimeters, it would fix itself.
BBL tech support have been great in responding to my issue and are sending me a replacement AMS internal hub motor. Hopefully that will be it fixed for good.
@G3Ellis the filament snapping is a good sign its needing a session in the heat of a dryer or if you have an X1 on the Plate with the preset drying function.
PS. When I respool I always sit the freshly wound inside my cheap dehyrdrator for a few hours to release tension (from the respool), it doubles up and usually loses any hidden moisture at the same time
Update - I have found a solution that seems to be working. In Makerworld, there are various AMS Funnel Feeders that you can print. You insert a piece of polytet tubing with about 10mm out of it. No more hangs.
It might. If you get it feeding smoothly, there may be less slipping. If the edges of the reel are glazing, you might try a diamond saw technic, pinging. Pinging involves tapping the edge of bastard file (real name) along the edge of the blade. This roughs it up and exposes diamond. You don’t need to expose diamond You just rough it up a little.
Oh, and another thing. Adding the tubing accomplishes more vertical separation from the reel instead of pulling on a straight tangent from the funnel. This helps unstick that edge stiction of the filament as it feeds.
did the motor fix the issue? im having trouble right off the bat with slot 2 . it feeds but not as far as the other slots and after that is does nothing
Was having this problem over and over on a new P1S with AMS and hub. Thought it might be the tube being to long from the AMS to the printer or too kinked (not really kinked, just a gentle spiral) or not inserted all the way into the AMS or something… driving me nuts. Messed up a bunch of prints; was of filament.
But! I think the problem is that the spools I printed had a very small bump (< 0.2mm) on the outside diameter where the print stops and starts the circumference when printing. When I rolled the spool in the AMS by hand, it would bind right at the spot where a bump was on the roller. It’s such a tiny bump I’d never believe it would cause a problem but it clearly binds at that spot preventing the spool from turning without extra effort (thus over heating the motor). I’ve sanded off the two small bumps on the outer rim of the spool, one on each side, and the spool turns without binding in the AMS.
I think it’s like a scooter with small wheels (the rollers on the AMS are small compared to the diameter of a spool) and a small rock can bind up a wheel and send the scooter rider flying. Maybe bigger rollers on the next redesign of the AMS would over come this funny problem of geometry. For now, ensuring the outside circumference of the spool is completely smooth seems to do the trick (for me). I’ll post if it’s still failing after more testing, so far so good.
Meh, still same problem. Bumps are gone, spools are smooth turning in ams but still get an overload error. Going to remove the AMS Hub and go back to the simple hub. I have a 2nd P1S with AMS and have not had the same problem with it. The AMS sits on top of the printer on the machine that works, and beside the printer with the machine that gets the overload error. I’m wondering if the shaking of the P1S is keeping things moving in the AMS on the machine that works without issue. I think that will be my final test is put the AMS on top of the failing machine and see if the vibration might play a part.
it will cause odd issues which may catch you out. Just respooling my latest order, the wood ABS looks fun but I know its gonna hurt.