Summary

Update, Printed these in PLA, being bigger then the other version thats on here, they do not seem to melt so bad to the bottom of the heat bed. But I only Heat to 65c on first layers, and 60 for the rest. So not sure how well they hold up on hotter temps. I may reprint in PETG now that I have some, and working on print settings.

This are Spacer cups for the Springs on your bed. They help with stability so your bed doesnt wobble on the trolly plate.

You need to print 6 Total

The holes are purposefully made undersized.

3 Of them you can thread onto your bed screws, and act as sort of a nut. This keeps the screw snug to the bed and prevents it from turning. It also helps keep the screw perpendicular to the bed as well. On one of my printers i had these screws adjusted loose to level the bed, and it wobble bad and caused X n Y shift in the layers.

3 Other screws can get drilled out ti 4mm or whatever is close so the screw goes through freely.

Printed these with

20% infill out of PLA

Just make sure your bed is level, and you go slow on the first layer so the wall of the hole is nice and true. I usually do a Brim to help with purgeing.