With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
If I wanted to leave an opening for a sink, how would I adjust the form?Would I just put in a second form, in the middle of the main one; before the concrete is added?
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.