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First, I would make sure the filament is grinding or not. Then I would pull a 'clean set' of filament so that you no longer have any grind divots in the filament. Basically that means that you should pull the bowden tube out of the print head, release pressure off the feeder and pull it through until it is a clean area. Yes, you will lose the length of the bowden tube of filament, but I have found every now and then, the grindings create a weak spot that can bend and catch in the head block area.
Keep in mind that I am not sure if it is the head block as I have the UM3 and only used to the print cores. But it is in that same area that it can create an issue.
If you are doing cold pulls and it is snapping, I would think that you are letting it get too cool. Maybe the steel print core dissipates the heat quicker?
And, possibly, you need to increase the tension in the feeder, or increase the temp of the filament or maybe the flow pressure.
Try one thing at a time though so you know what changes will make a difference.
Just a lot of guesses I would start with in no particular order.
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Here comes Cura 5.9 and in this stable release we have lots of material and printer profiles for UltiMaker printers, including the newly released Sketch Sprint. Additionally, scarf seams have been introduced alongside even more print settings and improvements. Check out the rest of this article to find out the details on all of that and more
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kmanstudios 1,120
First, I would make sure the filament is grinding or not. Then I would pull a 'clean set' of filament so that you no longer have any grind divots in the filament. Basically that means that you should pull the bowden tube out of the print head, release pressure off the feeder and pull it through until it is a clean area. Yes, you will lose the length of the bowden tube of filament, but I have found every now and then, the grindings create a weak spot that can bend and catch in the head block area.
Keep in mind that I am not sure if it is the head block as I have the UM3 and only used to the print cores. But it is in that same area that it can create an issue.
If you are doing cold pulls and it is snapping, I would think that you are letting it get too cool. Maybe the steel print core dissipates the heat quicker?
And, possibly, you need to increase the tension in the feeder, or increase the temp of the filament or maybe the flow pressure.
Try one thing at a time though so you know what changes will make a difference.
Just a lot of guesses I would start with in no particular order.
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