Help from the other side (Full printable riser)

I was just sitting at my computer when a portal suddenly appeared in my wall. I was very scared, but I quickly realized that there was nothing to be afraid of. My new friends are helping me in my workshop. They're holding my monitor, headphones, and instruments. And I treat them to red bull. :)Science fiction fans will love my monitor holder in the form of tentacles emerging from the portal. In the files you will find the portal divided into pieces and the portal as a whole. The dimensions of the portal are 840* 575 mm, so for printing you will need to divide it in a slicer for your printer. Glue can be used for assembly. I welded the parts using a 3D pen and I advise you to do the same. It is better to use transparent plastic to print the portal. 15% filling, 2 walls, 3 layers of bottom and lid. Tentacles are better printed from PETG or ABS. 5 walls, 25% filling. The tentacles carry a lot of load, as they hold the monitor and tools. The upper tentacles holding the monitor can chan