me or him?

Pretty sure they are just the start/stop points of lines(seams). Other than printing in vase mode they are nearly impossible to totally get rid of due to the nature of FDM printing. Things like coast, wipe, pressure advance will all help but when you have molten plastic being laid down in lines that start and stop there's not much that can be done.

Best thing you can do is properly tune your extruder, filament flow and work with pressure advance.

@jorge said in Blobs at every start and end of line:

I think the heatsink has no effect

the bowden retention mechanism can have an effect. A small play can lead to retraction problems.

I.e. this heatsink from aliexpress is very close to the e3d one
https://www.aliexpress.com/item/32842829820.html
whereas this one is using a push fit connector which can fail after some time
https://www.aliexpress.com/item/32504536967.html

Seems like most of you have a very high pressure advance. I run a Zesty Nimble on a Hypercube Evolution with a 0.6 mm E3D Volcano hotend. Sweet spot seems to be somewhere around 0.01-0.03 depending on how flexible the filament is.

I usually run 2 mm retraction at 40 mm/s, seems to work good for the Volcano.

I created this script to generate test files for pressure advance calibration if you would like to try:
https://github.com/LHelge/RRF_PressureAdvanceCalibration