The solution for bed leveling with no loss in bed height
It is very simple yet very effective it is simply two hollowed out shafts that slide inside each other that the screw can pass through each shaft has a 2mm base or cap for support the key thing here is that there is an internal spring that pushes the two shafts apart.
as can barely be seen in the images
The problem before with just springs is that they generally have no horizontal support and could allow the bed to shift as the bolt tips the intermingled shafts help prevent this.
This was actaully but together with a spring from a pen but was designed for use with a spring from MCMaster-Carr but could be used with similar springs else where.
The important specs:
Item: Metric Compression Spring
Material: Music Wire,
Length uncompressed: 19mm Overall,
Diameter: 9mm OD,
wire width: 1.00mm Wire-WOW nice and thick should make it stable horizontally
compressed height: 7.5mm
so fully compressed the height will be 11mm current height is 12mm it expands about 8-9mm but you should not need nearly this amount.
The McMaster Carr product number is: 94125K633
and the link is: http://www.mcmaster.com/#94125k633/=p19bik
the cost for the springs is just over $10 for a 5 pack but should be extremely stable in the horizontal plane
The current shaft will have to be removed in order to implement this leveler as the new shafts take its place.
I am glad that so many people are printing these things out and using them I just added another it is called robolevel7mm.stl , it is very similar to the original. The only difference is the smaller piece only has a 7mm hollowed out section to allow for a 7mm spring as the 9mm may be hard to come by still focus on 1mm wire size and the rest of the specs as close as you can to get optimal use
I just uploaded the netfabb repaired version for both groups because I think something happened to the originals as some were having trouble with it, sorry if this caused any inconvenience.
I recentely added the extra nut and washer(in the circle in the last pic) and it now makes the entire thing mush more steady and easier to adjust the main instruction is in the description but I am adding this as well the exploded view is a better way to install it on the rail system the Robo currently uses. Normally the screw/bolt coming through the rail and the original stand off was not menat to be moved so it was simply screwed down tight but when using the bed levelers some times that screw would turn when trying to adjust the locking nut on top so I added a flat washer and an additional nut that goes inside the lower portion of the bed leveler to lock that screw and the lower part of the bed leveler down and keep it all from moving. That potentially loose screw becomes a locked down stud and the spring then simply rests on top of the nut and makes adjustments very very easy now just a turn of the nut to raise or lower the bed without having to try and get underneath to hold the screwwhile turning the nut.