Im still new to CAD and this is the second Design I made (the other one is still not printed ;) ). 

It's a vertical stand for MacBooks to use in Clamshell Mode. I use it with a MacBook Pro M1 16" (2021) but other Notebooks up to 20mm thick should work too. It has two additional Compartments for external HDDs or SSDs. both 20mm wider too. They fit my 2.5" Backup HDD from WD or two of my smaller Samsung SSDs that I use for photos and stuff. 

Cura says, model is not watertight. I looked for the problem but didn't find it (as I said, still very new to this). Cura corrects the problem automatically and it printed without any Problem. 

You should activate supports for Printing. 

If you want to tinker around with the model, the link to the Onshape File is this: https://cad.onshape.com/documents/ce3ac2e3fa0d7a63451ca119/w/01a30ac632ebc0c63bc307b8/e/1c4b4536c092e1def6686f39?renderMode=0&uiState=6403bef30066f26b4aeb12e2