3D Printing Forum

Any tips on how to reduce these strings?

Interesting how it's only on one side

It could be the tension from the bowden angle. Filament inside a bowden has preassure that can increase by the angle of the bowden. That's why some users buy ptfe bowden to change the pfa standard bowden (it's a litte bit more slippery).

Also maybe you have too much cables around the bowden making it curve too much on some positions.

It looks like the temperature is slightly to low for the print speed.
This is the type of failure you get on the volume flow test for PLA, a slight 3-5'C temperature increase should solve the problem. If you are using the new Cura version check the settings for the speed of the walls, I don't print above 50mm/s for a 0.4mm nozzle.

Thanks

I was printing 45mm/sec at 215. I'll see what 220 does on the next one

220 really helped! I went from a bunch of strings to maybe just one or two.

You know why?

More heat, less tension inside the bowden. Filament inside the bowden compress/decompress with each move. If you print hotter the filament exits faster and there's less back-preassure from the hotend, so when you retract it flex less.

That's good to know.

Asides 3 minor blobs on top....I'd call it almost perfect!

Well same temp speed and fan all through print. Suspect filament tangled and cleared itself. Thoughts?

I think you are just over the top end of the optimum temperature and speed for the material. Sometimes pushing the temperature up to maintain a high speed doesn't work as sometimes the material almost seems to harden in the nozzle and not flow, I would drop the speed by 10mm/s, some times a print speed of say 40mm/s means doing the job in 1 build.

Well I decided to try a different brand filament. I have two rolls of Matterhackers PLA Pro still sitting in their vac-packing and desiccant

I have used their black filament with no issues, but it was super glossy and made you wonder if you had a melting print!

I cracked open and loaded the yellow filament and am really impressed with the results...
I have a new spool of Colorfabb Dutch Orange en route and am curious how that will perform.

I usually have really good luck with Colorfabb but maybe it's time to sample some other brands.

Just wondering. What's your room temperature?

Basement is warm this time of year...on the humid side too.
65F down there last night

So 18C? That's quite cold. Nevermind. I had some really bad problems with colorfabb as soon the room temp goes 27-28C

Use a dehumidifier if you have your printer in a basement room. Your printer, your prints and your filament say 'thank you'...