Bed Leveling Knobs

I designed these bed leveling knobs to add a bit of a touch up to my Anycubic i3 Mega S. 
In addition, the print bed can be better adjusted due to the better grip. 
You only need M3 thread inserts and the appropriate soldering iron attachment. 
I printed the knobs with 40% infill (variable) and a layer height of 0.15mm. 
When inserting the threads, make sure to keep the soldering iron and the insert straight.