Sra1
21
Looking very good - some great overhangs around the eyes - very nearly there!
The few tiny blobs - all aligned to the left, this looks like blobbing on layer change. Bowden extruder? This might be fixed with retraction, try increasing retraction distance and/or retraction speed. Reducing the filament multiplier ever so slightly might also help. Like .98 instead of 1.0, tiny increment.
The tiny air holes, looks like the layers didnt bond properly towards the top. Can you change print speed mid print? Try decreasing speed towards the top of the model. Drop it 10% and see it goes away - if it does, you may need to lower your print speed. Increasing temp a few degrees might also help. Try 215 degrees. Lastly, decreasing layer height should definitey solve it. What layer size was that - 0.2mm? Moving to 0.1mm should solve it. If all else fails, do you have a layer fan already? If its on, turn it off towards the top and see if this improves. Or if its off already try turning it on, or adding one if you dont have one.
good luck!
1 Like
Pyr_X
22
Thank you!
Yes, it’s a custom Bowden I printed and I am presently using a retraction distance of 1.0mm so I bumped it up to 1.2. I raised the temp to 215 and I am still running my prints off at 0.2mm until I feel confident that the nozzle clogging issue is gone.
I am running off another test print now using the changes.
Note: Printer it’s self does not allow a speed change mid print… Maybe the software will?
Sra1
24
Yep the software should do it somewhere. If not just print slower from the outset.
Your retraction distance reminded me of the E3D troubleshooting page, they recommend 2mm-5mm, and acknowledge its a fuction of bowden tube length, sadly no magic formula. My bowdens 45cm, retraction 2.5mm @ 40 mm/s.
Pyr_X
25
It’s been a little bit I know but I have been hard at work on rectifying the issues. I do believe that I have reached a point where I can say that everything I was having issues with has been solved.
I want to go over a quick summery of what I had to do in the end:
- Replaced my whole extruder with a Nema 17 5:1 Planetary Geared Extruder - The NEMA 17 alone did not have enough torque to push the filament through the all metal hot end causing the clogs in the nozzle.
- Lowered Printing Temps - 200 - 205c - Using anything higher will cause the PLA to degrade in the nozzle causing, clogs…
- Adjusted printing speed better to suit my extrusion rate - 50 - 65 mm/s w/ variable extrusion multipliers
- Recalculated the extruder steps per mm for use with the new Bowden Extruder which is SIGNIFICANTLY stronger than the last one. I used the following formula to do so: (Steps_Per_Rev * Microstepping * Gear_Ratio) / (3.14 * Effective_Dia) (Note: more info on my community page)
- Replaced my slicing software - Now using Simplify3D and loving it!
I will not be stopping my work on this printer after this little hill I just managed to get over, my goal is to install dual Pv2 Hot Ends and for anyone who might be interested in my work including photos of all of the work from start to finish you may check out my community page here: https://www.facebook.com/xploitninja/
I would really like to thank everyone especially you Sra1, thank you!
-Pyr_X
Sra1
26
Most welcome, delighted to hear things are resolved and happy to have helped. Facebook looks great, prints looking amazing, well done!
