Review on Befenybay Collar Shaft Screw Printer by Andrew Gomez

Remove deburring tools, files and rotary tool/grinder. You will have some work to do when you buy them. I couldn't get any that fit the 8mm linear shaft. If I didn't need them immediately I would send them back. I spent an hour filing the inside of them and then rethreading to clean up the threads a bit so they would "kinda" fit the 8mm linear rod. I didn't even want to risk putting her on a T8 line and damaging her. Also in design M3 grub/tap would have been better as they could bite a bit better. and not be so loose in the set. I ended up dropping the M4 head to get a better one, coated (and silicone tipped to prevent slipping on the shaft after tightening) which will not corrode due to the use of two different steels. As the name indicates. States, these are locking rings for setting the maximum drilling depth. I wouldn't recommend using them for linear motion where tolerances require proper adjustment to actually prevent something from slipping or holding something in place. *The reason they didn't get 1 star is because they're hardy. will. And it would be great to use as a drill stop or to teach someone how NOT to do something. Also, for me, 1 star requires a complete lack of features and quality. In the end, I got what I paid for.*