It was a little tight at first. I just pressed it in and out a few times and now it fits perfect.

I printed the base at 50% infill to give it a little weight and then reduced after that.

Gridfinity by Zack Freedman is an open source design specification for printable organizers to optimize shop workflow.

Thwack by Mr Megatronic can be found here www.printables.com/model/46099-thwack