First Layer issue and nozzle oozing
I have two issues that are causing me problems and I haven't been able to find a clear solution.
- The most pressing issue is illustrated in the attachment, on my first layer the support will start to lift at the ends. I've used the glue stick and the layer seems to be reasonable firmly attached, but I can't figure out what the cause of this lift might be. the lines seem to go down fine, but then within a second or two, they start lifting. Maybe my Z height still isn't enough?
- The second issue is that I am experiencing excessive oozing that results prior to the print. This is resulting in material wrapping around the nozzle that sometimes grabs the brims or support lines and rips them up as it solidifies.
Re: First Layer issue and nozzle oozing
Have you calibrated your extrusion rate? Both of these problems could be caused by over extrusion.
I would eliminate that first and then if necessary repost with details about the exact material you are using as support and the temperatures.
Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor
Re: First Layer issue and nozzle oozing
Along with sorting out your baseline of a dialed in printer, such as first layer height (aka Live-Z calibration), PID cal. and basic maintenance such as thoroughly cleaning of your PEI sheet with Isopropyl Alcohol. You can try building-in discardable adhesion appendages such as bunny ears to your model. In your case, I'd recommend a forced brim across the outer edge of your grill that can easily be cut off with edge snips. This is a brute force method of overcoming shrink rates of a specific material, but it works. If these are production parts that you need to minimize post processing time, enclosure and heat jackets may be useful. Enclosure is obvious, heat jacket is additional walls not attached to problem areas that provide both gust shield and more importantly additional thermal mass to smooth shrink rate reducing curl stress particularly in heated-bed+open air scenarios.
MK2S kit owner since 8/15/2017
Re: First Layer issue and nozzle oozing
While I don't think this is the actual fix, I was able to resolve the issue by switching from PrusaControl, to Slic3r. Once I started using Slic3r, I reduced the speed of the first layer by a substantial margin, and the first layer adhered without any issues. On the other hand, my print failed, but that appears to be due to my design. The oozing was relatively minimal, this time and didn't cause any issues, but in either case, I hope I learn what is needed to address these as I learn to design for 3D.
I take the advice of checking my calibration and deleted all the data while performing the calibration steps again. I was able to print out two Prusa provided models, but when using others they failed, which lead me to switch out slicers.
,Stephen