I made this alarm clock stand with tinkercad. It's the only progrma I can.
I made several designs. These are the fourth designs.
All parts do not need supports. infill : 20%, 60%(only bell)
In my case, all parts fit perfectly.
I printed without any Brims and Rafts. But it may be different depending on your 3D printer.
If you have problems with the bell pillars during printing, you can choose the bell2.stl. But you have to cut out the marked part of the picture after printing.