Summary

Here is a display I made for my assorted speed cubes so they wouldn't be on one surface taking up a lot of space. This fits standard sized cubes (5.7cm²) or smaller, the top spire can hold a large cube as long as you have the room laterally. Mine is holding a 6.5cm² 7x7 cube. This will fit inside an Ikea KALLAX shelf.

If using transparent filament like I did use concentric infill at at least 6.5% infill to ensure all tops print properly. Mine used 5% initially and the tallest three needed to be reprinted to make sure the tops were supported to be precise, otherwise the cubes cannot balance.

Using a solid colour would allow for your preferred infill with less fuss.