The Extension holders are various sizes for the front and back end of the extensions and other tools. Tried to design a smaller footprint so you could gain space for more tools. They will also work for the back side of the socket wrench again giving you more room to add more tools. You can mix and match to get them to fit what you have.
If you use a slicer that has tree supports then lay the extension ones on its back and turn on tree supports on build surface only. On the ½" Wrench Holder you should go with tree supports as well and the pegs down. It makes getting the supports off really easy with a knife in one corner and turn it a little.
The author marked this model as their own original creation.