Geeetech

ABS / PLA does not stick to the table, I do not know what to do.
Do I have to put glue or something?
Or some setting that are not correct?
My printer is an A30.

The work table (hot bed) must be clean and properly warmed up.
You can buy something similar:
https://www.ebay.com/itm/3D-Printing-Bu ... 8183943?ss

I use something that nobody has come up with here ;-)

[attachment=0]lakier_do_wlosow.jpg[/attachment]

The cost is small, the effectiveness of good, smells good, it is easy to wash off with clean water. ;-D

Have you leveled your printbed correctly?
It's really important to do an manual leveling procedure, fit a standard A4 paper between the nozzle and the bed.

Also, what temperature is your bed during print? And what nozzle temp do you use?
There are many possible reasons for a print not sticking to the bed.