I saw it on Facebook and wanted to recreate it. And it works better than I expected. Someone told me this part was in a children's magazine in 1988. So it's not my idea but another remake of the 'historical' template.

Printing tips:

You have to turn the covers over and print the bases as in the model. At the large base with support structure in the middle. But that's easy. If you flip the slider, you would have to insert and remove brim. That doesn't look so good revrse. That's why I printed the slider in the same position as in the model with support at the bottom.

The middle base can easily be inserted through because of the gap (0,7 mm) if the large shelf is slightly bent. Depending on the accuracy of the printer, the lids will also hold without glue. I left a gap of 0.3 mm. If it doesn't slide easily, you can sand it a bit to make it fit.