This topic contains 17 replies, has 5 voices, and was last updated by 
Jack 1 year, 2 months ago.
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Hi Guys,
Still not really getting on with my printer since being repaired and upgraded from kickstarter to production.
I have performed all calibrations repeatedly, played around with the profiles, adjusted filament properties but cant seem to mitigate the pattern. To describe; it is the fusing of the inner lines, where as spaced outwards near the sides. My part is printed and sold so aesthetics are critical, but I just dont know what to do.
Any suggestions ? @pete @bhudson @click
Material XT Colourfabb - Black
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This topic was modified 1 year, 3 months ago by Jack.
Have you dropped the nozzle height calibration down slightly? This will create more squish for the first layer. You could edit the head values for Z.
Decrease the Z height for both nozzles equally. Try decreasing the numbers by 0.05 then do a test to see what the first layer looks like.
@siymon might have some suggestions. He is “working” from home today….
@jack-strong I see two possible issues - 1. Your nozzle height needs to be lowered about 0.05 to 0.10. This will help fill in the cracks. 2. Your bed is higher in the middle. Either your bed clips have been over-tightened or you need to pull the bed sheet and flex/bend it so that when you re-install it the edges want to be higher than the center. This will push the center down against the heat plate. If you have done this already, it could be your bed clips are too tight and are pulling the edges of the PEI down too far, forcing the center off the heat bed.
Just out of curioisity, what are your current settings for XT? If the filament multiplier is less than 1, you may have a printer issue.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/benI get this same pattern shape no matter where I print on the bed, so don’t think it’s that.
When printing, perimeter first, then the central bit, which is tightly packed/fused, then it jumps to the right and fills in there (open spaced), then jumps over the middle and fills in the other side. Overall forming this pattern.
So I guess what I’m asking, is it down to this fill method ?
Or something wrong with the hardware ?
I never had this problem pre repair when running on AM 1.02. Can I revert firmware and software ?
thanks for your help guys
+ currently keeping XT on robox default settings.
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This reply was modified 1 year, 3 months ago by Jack.
alter the nozzle height as suggested and test.
Jack,
I have a relatively flat PEI bed and a well calibrated robox.
Still, I will never get that bed perfectly flat.This results in:
- first layer pattern like on your picture if I print in front of the bed
- perfect first layer when I print in the middle to the back, as long as I avoid
the first 5 cm on left or right.I’m almost done with PLA (made some prints with AM claiming 0 gr filament),
and when I switch to ABS and nylon I will start using my steel geckotec plate, that doesn’t flex at all.java (EE), JavaFX, HTML, GIS) programmer, database wizard, framework inventor, looking for a job ! http://roboxing.com/wizards
@pete - reduced down but there are still 3 type zones in the fill and at the two interfaces it is almost transparent. When moving to fill another zone does the head go up then back down ?
thanks
@jack-strong If you are using Cura you will get the three zones. Slic3r will give you a more uniform fill pattern.
You also will always have some pattern on the bed interface. It is unavoidable with a 3D printer.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/benWe sometimes use the hot air from a soldering station to smooth rough areas or remove tiny strings, it is quite easy and controllable.
Do you think If I had a faulty x axis bearing/motor It could be the cause of the problem ? On the initial purge as it moves the bed there is a real grinding noise, and in general I would say there is a lot of whining coming from the motor.
Trying to find a solution to this, doesn’t matter what settings I adjust, or calibration, I always have gaps.
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This reply was modified 1 year, 2 months ago by Jack.
@jack-strong If you hear a grinding noise during any axis motion you probably have a motion drive issue. The bed moves for the Y axis - you should be able to move the bed back and forth pretty easily with no sticky spots. The head moves for the X axis and the same principle applies. If there is significant resistance or sticky spots, you may have a bearing issue. You should also check for linear scratches on the large bearing guide rails for both X and Y.
I operate two Betas and one Production Robox.
I am the US/Canada Technical Support engineer for the Robox.
See my 3D Hub site at https://www.3dhubs.com/phoenix/hubs/ben -
This topic was modified 1 year, 3 months ago by
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