My take on the ever popular tool to easily and accurately create rabbet and dados with a table saw, graduations added to each side for the estimated kerf and stock width, should just be used as a guide, this is 3d printing after all.
Designed specifically to print without supports ( You'll probably have to rotate one of the parts, I don't think I uploaded the correct print orientation, but should be an easy print )
You'll only need 3 different parts, I tried to stick with parts that a lot of us with 3d printers might have laying around, links to amazon below, disclaimer that they are affiliate links if you choose to support my work great, if not that's cool too ;o)
Also you'll need a solder iron to set the heated insert and I just used epoxy to hold the bolt in the knob ( yea, was being lazy there but it actually looks pretty cool if you fill the hole to the top with clear epoxy on top of the bolt)
See assembly image attached, should be pretty self explanatory. Also, mostly parametrized, fusion 360 design can be found attached as well if you wish to modify.