With this model you don't have to cut your spacers if all of them are the same height.
Inner diamater: 16mm
There's an off centered version to not to touch the bed if you print with PLA.
Print details:
Layer height: 0.3
Material: Creality Hyper PLA
Infill: 20% (it's up to you)
No supports needed.
The author remixed this model.