Mobius (Moebius) strip in stand. No support needed.

thingiverse

This Mobius strip design boasts an eye-catching appearance while maintaining ease of printing, thanks to its vertical layout. Two STL files are available, one featuring stabilizing posts and another without. The posts reportedly aid print quality at the standard size; however, their utility at 2x size is uncertain as it hasn't been tested. This design was printed using DiamondAge PLA on an Ultimaker 1 printer. Photos show the item still on its print plate before being removed and finished. The designer chose white for printing purposes, enabling a granddaughter to create a multicolored display by printing the stand, front, and back in distinct hues. Printing specifications include 210C temperature, 0.2mm layer height, 1.2mm shell thickness, and 20% infill without needing a brim, raft, or support. The print speed was mostly set at 50mm/s, but the final portion was slowed down considerably for optimal results. For the best outcome, it is highly recommended to print this design at double its original size.