bottom printing issue  

RE: bottom printing issue

you might try zipping up your .3mf file and attaching here so folks can see what your settings are.   Your vid doesn't have any sound so there's no explanation.

RE: bottom printing issue

@ibrahem

The video you shown, shows a multitude of issues, many are specific to the model your printing at the time, the type of plastic your using relative to the model being printed, and I spotted some cooling issues also. Probably the best way help could be offered would be if you had a specific model using a specific plastic that you needed help with, focusing on them one at a time will make learning what you need to know more clear and offer a point of focus for those attempting to help. currently you seem to have all the issues of someone new to 3d printing and you will have to invest some time in your education.

Good Luck and Have fun,

Swiss_Cheese

RE: bottom printing issue

Posted by: @ibrahem

I have a problem at the bottom of printing permanently( PLA, PTEG, ASA) , with support
I've tried many repairs and haven't found a solution.

Most of the highlighted problems, particularly those with the beige filament, are typical of problems printing overhangs with FFF (filament) printers. These are areas of extreme overhangs that need to be supported. Unfortunately, for supports to also be removable, we have to keep a gap between the supports and the supported surface above (set under Print Settings->Support material->Options for support material and raft->Contact Z distance). PrusaSlicer suggests 0.2mm for removable supports but I and many others find 0.25mm works better. Unfortunately, this means that the layers immediately above supports are literally printed in air. There is nothing below them to squish against to get those nice even extrusions that you see in other layers. They print with a round cross-section and often sag a bit. It's a trade off between not being able to print and being able to print a part.

In general, you want to try to eliminate the need for support in the first place. You can try rotating many prints at an angle. Many miniatures print much better if tilted back 45 degrees from vertical.

Unfortunately, whatever layers must still be supported aren't going to look as smooth as those without support. It's a limitation of current consumer-grade FFF printing. Angus has some good tutorials on this topic on his Maker's Muse YouTube channel.

RE: bottom printing issue

As a quick example, here's a print in the default upright position:

Notice all the blue in the mouth and visible areas. By simply tilting the print back, you can reduce the amount of supported area, and move more of the blemishes back into areas that won't be so visible or are easily sanded away.

RE: bottom printing issue

I apologize for the delay. I was trying to print a number of figures to get a good explanation of the issue

Let's start with the first issue, which is about printing a shape that is empty below it. Lines and extras appear as in the attached picture and youtube

best regards 

( )

Helix-Test-Cube

RE: bottom printing issue

The models that you are highlighting are going to be very problematic to print nicely on FFF printers due to the extreme overhangs unfortunately.