Blobs on top ONLY

[frijoli]

When printing this test pyramid tower: https://www.thingiverse.com/thing:2219103/#comments

I get this:

Not a string on the print until that, right at the end of the print.

[horst.w]

Thats not an object for using by beginners!

The groundplate of the object is 20 x 8 mm, therefore I guess the ground square of the towers 2 x 2 mm. That is realy difficult to print.

Mainly it's a problem of retract and restart also as a problem of kind of material, speed, temperature and the printer itself.

Regards
horst.w, GER

[frijoli]

I've been printing for a long time. This blob only shows up in simplify 3d, and only at the the top layers.

[dkightley]

If you really want some help here, why don't you attach a factory file so someone can look at your settings and suggest changes. File menu....save factory file.

Personally, I think you're printing either too hot or too fast.....or both. With no idea what you're settings are, I'm stabbing in the dark!

[horst.w]

I've been printing for a long time. This blob only shows up in simplify 3d, and only at the the top layers.

May be, but without any experiences concerning S3D-settings !

I repeat:

...
Mainly it's a problem of retract and restart also as a problem of kind of material, speed, temperature and the printer itself.

Regards
horst.w, GER

Simplify3D needs always explicite settings while Cura is a near half-automatical slicer that works very well for standard models

H.

[frijoli]

I've been printing for a long time. This blob only shows up in simplify 3d, and only at the the top layers.

I repeat:

...
Mainly it's a problem of retract and restart also as a problem of kind of material, speed, temperature and the printer itself.

Regards
horst.w, GER

H.

I am TRYING to figure out what in the retraction and restart will cause this. That's why I am asking here. In case you didn't realize the model was designed to test these settings. I have changed a LOT of retract and restart settings but I cannot get this to stop.
Do you have some insight as to what you would change first? Speed of print does nothing related to the blobs. Temperature does nothing either.

[dkightley]

There's an echo in here.....

If you really want some help here, why don't you attach a factory file so someone can look at your settings and suggest changes. File menu....save factory file.

[frijoli]

If you really want some help here, why don't you attach a factory file so someone can look at your settings and suggest changes. File menu....save factory file.

Personally, I think you're printing either too hot or too fast.....or both. With no idea what you're settings are, I'm stabbing in the dark!

I didn't see this post earlier. I will post the files.
Almost no difference in any of these printing.

[horst.w]

Attached your retraction2-file as correction - first try! PLA is not my favorite

First you need the exact messure of your filament with a micrometerscrew. 1.75 mm is often +/- 5 %
the multiplier value begins with 0.95 and is variable depending of the true diameter of the filament.

Then begin testprints with a cube, a really usual cube of 20 x 20 mm. If you realise a spledid print than you are perhaps able to print your towers.

There are a lot of dependences to you material AND your printer you must find out.

More to learn read here:

- viewtopic.php?f=8&t=2367#p9683 and here:

- https://www.simplify3d.com/support/prin ... eshooting/

H.

[horst.w]

I am TRYING to figure out what in the retraction and restart will cause this.
...

I guess you have a direct-extruder (not bowden ???) , because your retract was only 0.8 mm. If NOT, then 4 - 5 mm is right.
It needs to bring out by pulling back all pressure out of the melting chamber.

Your unusual high temperature of 215 / 200 -depending to a slow speed - (PLA 190 - 210, optimum you must find out!) cause a escape of molten filament after the pressure is zero. Therefore you must give a negative (!!!) value to Retract-Extra-Restart, you must lift the nozzle to have a proper new beginning of print on the next tower. No wipe and No Coast at end!

I think your adjustment of printing speed down to 5 % (Cooling) is very contraproductive, but you must find it out.

H.