I have printed Day1, day4, test case and manifesto case. On the latter 2 where there are untextured aread, I get vertical striations.
The attachments perhaps exaggerate the issue and maybe I am being too picky. Unless you have light reflecting off these lines (as I do in the photos, as well as the fact that these were taken with a macro lens) they are far less noticeable.
I have seen other examples of this on other hubs photos, but I’d love to figure out how to eliminate it. I am acheiving good quality apart from this.
I posted to the Ultimaker forum too, and have already tried a couple of things to eliminate this without any luck so far.
Apparently my posts on the Ultimaker forum need to be moderated until I’ve posted enough to satisfy them that I’m not a psychopath or something. So in the meantime i’ll post what I tried so far here:
I reduced the temperature in 5 deg steps from 210 down to 175, and also reduced the speed from 30 mm/s down to 75% on the front panel for the very low temp prints.
You’re printing this with the text facing forward / backward on the Y axis of a mendel-style “moving bed” machine, is this correct?
What I see there is vibration. Think about your machine not as an “X/Y axis machine” but as having a seperate X axis and a seperate Y axis:
The Y axis goes from moving at 30mm/s to instantly STOP (and the X axis begins moving) when it hits a corner. Because the Y axis weighs a fair bit and your model is ON the Y axis, it doesn’t physically stop when the motor stops spinning, it ‘wobbles’ for a little… The vertical lines you see are this “wobble”. The same effect is seen when the Y motor goes from stopped to instant motion. (you get the same wobble at the START of any direction change and it continues for a small length along the part)
Try these steps to help eliminate it:
1) Make sure your Y Belt is sufficiently tensioned
2) Check your acceleration settings in firmware (you can safely send an “M201 X250 Y250” command to the printer to set the acceleration to a low value (250mm/s^2) and if you find the vibrations go away, try again with M201 X300 Y300 and so on until you find a value that you are happy with. Too low will bring in other problems, around 750-1500 should work well for a mendel. X can usually be a bit higher, I run my mendel’s acceleration at up to 3000 on x) The difference you should notice is with lower acceleration values the printer will slow down in corners. These more “cushy” movements aren’t as jerky and reduce vibration.
NOTE that if your EEPROM is turned off, the above M Codes will be ignored and you will notice no difference.
Oh. you can add those M Codes to your G Code file (toward the top) OR if your host software allows sending of manual commands you can send it through the terminal of your host software (Repetier and Printrun at least allow it)
I didn’t experience this problem so I don’t know if there is anything else, apart from the changes you already tried, what could cause this. At the moment I don’t have time at all to “dive” into this but when I have any idea I will let you know.
Good luck! Its easiest to spot when moving slowly, watch the belt just as it comes off/on the pulley, it should be pretty much dead-straight and not jumping up and down (even a little)… Look at the top and bottom of every x/y pulley and watch it in both directions… It usually only happens in 1 direction so you must watch both!
Hi, I know this is an old post but did you solve this? Or at least find out what was causing it? I have similar problem that I believe is down to the slicing - probably something I have done, just testing a few of my suspicions now.
