Hi gr5,
Thanks for reply.
I checked all screws on pulleys and motors and YES all screws for motrs and set screws on pulleys were a bit lose.
I also checked on feeder as you mentioned I tried pulling hard on the filament and it was pretty okay but I made made it tighter, by tightening the spring on the feeder a bit. my filament always had some teethmarks from knurled bolt.
About settings in Cura:
I am using corse quality print settings and modified few settings under it.
When I started printing for current project after few pieces I changed filament and then after few more pieces it started giving me issues.
I am currently using setings that I have exported from Cura and attached it here.
Basically layer height is 0.4mm, line width is 0.4mm and speed of printing infill is 60mm/sec printing temperature is 200deg C.
according to formula you mentioned volume is 9.6cubic mm and may be the temperature of 200deg is not enough.
Should I change tmperature and how do I calculate what it should be?
I am printing quite big pieces so changing print speed will result in more printing time.
I think my teflon part should be okay as I havent print a lot yet.
Thanks for your help, I really appreciae it.
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gr5 2,224
I think you have 2 unrelated issues:
1) X axis slipped - you need to tighten the hell out of the set screws on all 6 pulleys on the X axis in particular the 2 on the short belt (the motor and the other one). These are harder to get to but you can push the head around and use the long green hex driver that comes with the printer. It's critical that you use a tool that fits nicely or you will wreck those set screws. Most people don't believe me that it is slipping so if you don't believe me then use a sharpie to mark the shaft and pulley on motor and the other pulley on the short belt. The screws should be so tight that you are afraid you will break something. The shaft of the hex driver should be twisting a bit.
2) underextrusion. This is cause for "lighter weight" and "weak part" and more. Much harder to isolate. Step one is to figure out if it is caused by feeder or hot end or settings. Are you printing faster or thicker layers than when it was working fine? If so that could be your culprit. The UMO should top out at around 7 cubit mm per sec at normal temps or 10 cubic mm / sec at bad-quality-high-printing-temps of 230C (okay to do if you are trying to print super fast). To calculate volume multiply print speed by "line width" by "layer height".
Test the feeder first - it should hold about 5kg or about 10 pounds - put the filament about half way down the bowden and hold the big gear with one hand and pull like hell on the filament. It should not slip easily. It should take about all your strength (or more) at that awkward angle). Lift a 10 pound or 5kg weight for comparison. You want the feeder on the UMO tightened such that the spring on the feeder is around 13mm. Quite tight. It should dig into and mark the filament somewhat.
If you have been printing hot for a while or if you have been printing 500 to 1000 hours or more, then you may be at the end of life of the teflon part. Those are "consumables". Like filament.
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