This design is tailored for the following:
Some considerations I've made to accomplish the above:
This will not work for all 2020. In particular, this will not work for 8020 brand of 20 series extrusion! Make sure you have extrusion that has a 5mm hole for an M6 thread, e.g. this profile:
I use this profile because it's cheap!
Additional parts are required:
1. Insert cam axle into the cam clamp, and the button head screw through the hole.
2. Tighten nuts in this position (finger tight). You can also threadlocker them in place.
I'm comfortable using this to power tap this with a hand drill, as long as I use a spiral flute tap and cutting oil. YMMV, be careful, wear eye protection, and have a backup tap!
Insert the workpiece in this position:
And tap in this position:
I have printed successfully with:
I've found this is more than strong enough.
When the cams are loose, they rotate and slip too much, which can also make it difficult to insert the workpiece. It would be good to provide a slight preload pressing the cams into the workpiece, in order to make the open state static.
The cam clamp dimensions are the result of the first swag. They could be further tuned. Reasons I can imagine to do so are to:
It would be convenient to store a tap in the handle
The author marked this model as their own original creation.