V2 Decorative Support Washer - Works well as a tarp retainer.

This is a Version 2  model for a decorative support washer for spreading the force of a screw over a wider area.

OpenScad script - parametric

Use the OpenScad Customizer,.

Version 2, adds support for an extended base, and the inclusion of a metal support washer in that base.

Slice, and pause the print at the last layer of the internal cavity.

Drop in an appropriate washer, and continue the print.

if large enough, drop in a penny or a dime,  complete the print and drill out the metal to produce the internal support.

Print in TPU and you have a bumper (see also the case foot model by the same author)