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Glensafro

Ultimaker 3 Stripping Filament

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Posted · Ultimaker 3 Stripping Filament

Hi everyone,

 

I'm having issues with the drive gears stripping filament on a dual colour PLA print. It seems to happen at random - both nozzles will be printing fine for a couple of hours and then out of nowhere one or the other will start having massive underextrusion and the filament will look as slightly torn up over a 10-15cm span out of the drive gear housing, and then the fatal groove where the gear finally ate too much. I'm using a "glitter" filled PLA with the 0.4mm AA print cores at 200C and 70mm/s. Here's a list of things I've tried to save people time suggesting things I've already done:

 

- Changing the tension on the drive mechanism. I've tried it real tight, real loose and everywhere in between and the only thing affected is how much the filament gets chewed.

- Thoroughly cleaning out the drive mechanisms, including cleaning the gears down.

- Cold pull cycling the nozzles. I don't think the issue is clogged nozzles as filament extrudes freely without cleaning the nozzle out each time I have a problem, but I tried this anyway.

- Changing the standby temperature from 100C to 160C and a couple of stages in between.

- Changing retraction distance, limit and speed to try to limit the number of times the filament was run over the drive gear in the same place. Feel free to suggest any settings you know to work well for 2 colour prints as I'm not sure I've covered all the options on the retraction side of things!

 

If anyone has seen this before or has any new ideas that'd be extremely helpful, thanks in advance!

 

Glen

 

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Posted · Ultimaker 3 Stripping Filament

Hi,

 

some markings on the filament after passing the feeders, like shown here: Marks-on-material.jpg

is ok and shows that spring pressure is set correctly. Tension indicator ad middle position is a good starting position.

 

Is it possible that your filament is blocked by some reason (for example tangled on the spool or similar)?

 

Greetings

 

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Posted (edited) · Ultimaker 3 Stripping Filament

Hi,

 

Many apologies for taking a long time to reply, we are a small company and I have to wear many hats in my role! So my filament looks similar to this when printing normally, with just the teeth marks, but more chewed up when a failure happens.The filaments I am using come on 1kg spools so I'm having to use a homemade spool holder as the UM3 holder won't accept 2 x 1kg rolls. I thought the spool holder wasn't the issue as the rolls rotate freely but maybe the feed of the the filament into the drive mechanisms is a tad too shallow and causing some extra resistance. I'm going to modify things to feed the filament in a little better and reply with my results.

 

Glen

Edited by Glensafro

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