I made this for my Kid, this was design for my ender 3, so the size is it limits.
The base have 4 little supports integrated easy to cut after print.
The Tray I printed with supports from Cura and with the SLT upside down. That might not be the best option because the supports were a little hard to remove from some parts.

Please be easy on me, this is my first design and just my second print after the benchy ;) but I'm very happy with the result.