Migrated to: https://www.printables.com/model/544154-handy-spacers-on-a-sprue-3mm-id-5mm-od-3mm-height Set this up because I often find myself needing spacers for mounting electronics. It's handy to print a few of these to have spacers around. They print well - much better than individual spacers in a pattern. The matrix of the sprue adds stick-down-to-print-surface strength.