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I am getting error code 121

I have replaced the switch at the top of the loop.

That didnt seem to help, any ideas?

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Hey @wpt7308, thanks for reaching out and sorry for the trouble. Error 121 usually means there is a piece of filament stuck somewhere in the path, or the filament is wrapped around the buffer because no more buffer is being made. Could you let us know which of these happened, and if it happens continuously, or for a particular print? Thanks for your patience.

Update (01/05/2021)

Hey @fijibubba and @bronek, please make sure your print speed does not exceed 50 mm/s, and if you have a CANVAS Hub, please enable to the “slow down during splice” option (instructions here). If the issue still persists, please remove the scroll/encoder wheel, clean it with rubbing alcohol, recalibrate SPC/PPM, reset Palette to factory defaults, and run the keychain once more.

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I’ve had this happen more then 10 times in the last two weeks. I keep getting an Error 121 because the filament is wrapped around the buffer (never for a clogged path). It always happens in the beginning of the print. Before this happens, the buffer switch is usually actuated 1 or 2 times during the print and works fine as more filament is advanced. Then the buffer switch will be triggered and no more filament is advanced and the error is triggered. I’m not printing fast and it’s not happening during a color change. What is the solution to fix this? I’m so frustrated and have wasted so much filament. I’ve tried everything. re-slicing, adjusting print speeds, resetting power on everything. Nothing works.

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@fijibubba Hey Peter, could you tell me what your SPC/PPM values are, found under “About” on Palette? After you jot these down, could you do a quick reinstall of your current encoder/scroll wheel by following the instructions here (mm3d.co/replaceencoder)? Please remove the wheel, clean it with rubbing alcohol, and place it back. Following this, please recalibrate your SPC/PPM by following the instructions here (mm3d.co/spcppm). Let me know what your new values end up being and if you have any questions about these steps - it should help the buffer issue you are having.

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Alina,

The video you attached was for encoder replacement. Not scroll wheel replacement. I imagine the single screw holding the metal scroll wheel on will do the trick. The plastic one I assume will remain in place.

So removed the metal scroll wheel, cleaned it with rubbing alcohol and used a Q-tip with rubbing alcohol to clean the grooved area of the black plastic scroll wheel (in place with out removing it). I ran the recalibration and the numbers are as follows:

Old SPC: 2.50

New SPC: 2.49

Old PPM: 40.03

New PPM: 39.60

The numbers seemed very close....

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@fijibubba Hey Peter, apologies for the confusion - the encoder wheel is the scroll wheel, it's the wheel covered by black rubber. You would have to pop it out of the substructure to fully remove and clean it. Could you try the steps once more with this wheel, and then try to run a print? Let me know if you still get the buffer issue following this. If you could also please share the print project with me, that would be very helpful as well (instructions here: mm3d.co/canvas-sharing).

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Ok will do.

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Alina,

I've completed about 10 prints (100+ splices) since removing, and reinstalling the encoder and cleaning the scroll wheel. It seems to be working. Thank you.

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No problem! I'm happy that helped. Let me know if you run into any other issues.

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Alina,

It did it again. There are no obstructions in the path. The pictures were taken before I cleared out the palette, after the switch was triggered.

Block Image

Block Image

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I am guessing that if there is a discrepancy between how much filament is being pushed by the drive gears and the exit encoder 121 error is tripped.

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I have the same problem!! Makes filament fine at start, but when the print starts it just uses up the filament buffer and jams up against the switch.

Any ideas how to fix other than what was posted above?

New unit only printed 3 keychains so far.

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I still can't get my palette to work properly. It had me fooled and worked for about 3 days without throwing and error, been plagued ever since. I'm still getting the 121 code not matter what I do. I've tried all the recommendations from Alina.....cleaned the wheel, reset the printer, unplugged and cleaned the connector on the encoder, etc. It will start the print and work fine for a little bit as it makes filament and hits the buffer switch with no problems but then it seems to stop working and hits the switch only to stop instead of create a buffer of filament again. I'm so beyond frustrated. This thing is nothing but a brick. I'm beginning to think its a software issue.....any help here? replacement unit? refund???.......

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@fijibubba Hey Peter, thanks for letting us know. Could you please send me an email to alina@mosaicmfg.com and we can discuss next steps?

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After many weeks of grief this is what solved my problems with 95a TPU.

1) Remove the whole splice core cartridge from the Palette 2s.

2) Manually push a sample off the filament you plan to print with thru the splice core and make sure it slides thru VERY easily.

3) Reinstall the splice core

So far no problems for over 550 splices. Found that for filament over 1.77 diameter there was resistance and this would lead to misc jams and 121 errors.

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I have same problem….after one day of print and 258 splice i got this error. i clean the things and its still the same.

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Hey Daffod, were you able to check the options that were shared above, including lowering the print speed, cleaning the encoder wheel, and ensuring that the filament is properly passing by the encoder?

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Yes i have cleaned it about a dozen time and prints are running at 40-50MM at max. I try to print gradient mode with or without printer, its same. Buffer switch will be triggered to pull filament but no filament goes by and snaps as extruder will pull the filament and palette is not sending any.

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Thanks for this information. Are you running this in Accessory or Connected mode? Also, which version of Palette's firmware are you currently using?

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