I liked the original heavy duty design made by thfo (http://www.thingiverse.com/thing:2045424), but it needed to be tweaked for the Anet A6. FYI I use 3mm glass on my hotbed.
Below are the changes and improvements made:
- Moved the screw hole to center it for the A6 hotbed and allow it to be tight on the edges of the bed.
- Increased the screw hole size to allow the M3 screw to slide through.
- Added a circular slot around the screw hole to keep the bed spring centered.
(Best when used with spring washers on the bottom as well:
- Created a home corner version to avoid the head hitting when at the home position.
I printed it in PLA since my bed never goes over 60C, but you should use a more heat resistant filament if you print in ABS, or other high heat filament.
Do NOT use the full holder on the home corner, the pre-extrusion happens directly on the holder. Use the home corner holder for the home corner.
If you have any suggestions, or improvements, let me know.
EDIT March 27 2017: I have uploaded Version 2 of the home and other corner holder. This version has a larger slot for the springs. I have not printed the new version so please comment if the slot is too large.
EDIT December 14 2017: After feedback from Peroxyde who printed both version 1 and 2 of this thing I have opted to delete version 1 since V2 fits best.
15% or whatever you like, makes no difference.