This topic contains 31 replies, has 9 voices, and was last updated by jhr 5 months, 3 weeks ago.
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Both @azk13 and I had the same problems earlier this year and both of us decided to just ditch the side panel to allow the filament to be fed in sans the filament guide. I have not seen the filament slip error since. I am quite surprised there weren’t more complaints about this to be honest, so it makes me wonder if we have dud extruders 😛
Good job on the modifications, makes things very neat!
Really nice mod. It is worth preserving it for the future. @miffmaster why don’t you add it to roboxing.com? More precise here: http://roboxing.com/robox_accessories_and_projects
@miffmaster If it’s “hot enough that you do not want to touch it for too long” it will probably be 50C-60C, not a big deal, it’s normal for a stepper motor to produce heat. Sure reducing it through a fan won’t harm anything, but I don’t think it will make any difference either.
“If it’s “hot enough that you do not want to touch it for too long” it will probably be 50C-60C”
First apologies for digression.
@omega64 is probably right. That’s the way I was taught to make home made yoghurt: heat milk to boil and let it start cooling down. When it reaches temperature that when you stick a finger in (preferably clean one) and feel it is hot but you don’t need to pull it out (less than 50º) then add a few tablespoons of (normal, bought or saved from the last time) yoghurt and put the lid on the pot and something like duvet around it for overnight. It will keep heat for relatively long time due to being insulated to let bacteria multiply. In the morning you can pour it in wide neck bottles or any other container you want to keep them and move it to fridge. If you want ‘drinking’ yoghurt (the latest invention here in UK) you just quickly whisk it before storing it…
@miffmaster It seems to me that your extruder has worn out. The nylon gears are probably worn to the point that the pulling force has dropped significantly. I would open a ticket with CEL to see if they will replace the extruder worm and gear.
As I have been printing without this issue for a very, very long time with a lot of very stiff filaments including CF20, I think the problem is your gearing and if you continue to use that gearing it will eventually wear out to the point that it won’t pull at all as the worm eats the teeth off the gear.
I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben#miffmaster If you look in the lubrication gunk you may see hairs of nylon even though the gear looks fine. That is a sign the worm is eating the gear. Since you have voided the warranty on the extruder, you can try adding a thin washer, about o.o10 to 0.020 inches thick, between the plastic frame and the stepper motor around the front mounting screw. That will tilt the stepper forward a touch and will help the gears mesh. If the washer is any thicker, though, it will jam completely and the extruder won’t work at all.
I think the extruders may be tested as you say at the factory; I have seen a few extruders with a number written on the bottom. I started paying attention to it and found that the lower the number was the less reliable the extruder was. This may have some relationship or it may not, I don’t really know what your issue might be, though it seems a weak extruder to me.
As there is no obvious damage to the filament, that means the skip detection is working correctly. Are you seeing underextrusion at all? Sometimes you can get a power issue in the head power cable that will cause the nozzles not to open consistently and that will cause skipping even though the extruder is working correctly. I had this happen and went through three extruders trying to find it until I found that I had a bad power cable between the motherboard and head carrier. Replaced that and everything is perfect again.
I very rarely use CEL reels since I use PET almost exclusively now. I don’t see any wear on my filament guides.
What metal are the worms of your extruders? I have noticed that they have recently changed the worm material; the new ones are brass and they seem to be a little more dependable than the older steel ones in my experience.
I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben@miffmaster It still sounds like you have weak extruders, or the filament skip threshold is set too low. But good luck.
I operate two Betas and one Production Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben
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