A stand for holding most sizes of round bottom flask similar to a cork stand, and modeled after one. The TPU liner is glued to the PLA base to prevent the flask from sliding around.
The file "ring_stand.stl" was printed with 3DSolutech White PLA, and the file "ring_stand_liner.stl" was printed with Sainsmart Black TPU. No supports were required for either part, as long as both parts were oriented as shown in the pictures.
The two parts were glued together with superglue, ensuring that the flask wouldn't slide around on the smooth PLA.
I measured the dimensions of the cork ring stand shown, and re-created it in Fusion 360.