Support for brio bridges, for smaller children - does not fall. The bottom height is 134 mm and 67 mm for my project next to https://www.thingiverse.com/thing:4665231 where in addition to 67 and 134 mm I also need 201 mm (combination of 67 and 134 mm), which did not fit on my Pruaa mk2.5 printer , so it is stackable. It is very tight, there is no need to glue, after folding with force (not to break the leg) it can no longer be disassembled. Very stable, thanks to the profile of the tracks it does not disintegrate during rough handling