Saturday, October 6, 2012

Print Bed Leveling.. Iteration 4

Well after trying a few different things and not getting them to work right, I had to buy a few supplies from McMaster Carr to get this final iteration. I had some 6/32 T-nuts already for the wood but couldn't find 6/32 cap screws anywhere. I had brass machine screws but realized that was going to be a pain to try to get a flat head screwdriver in and position to level the bed. I wanted cap screws so I could use an allen wrench to tighten them like before. I went with 1 1/2" to make sure I could make it through the base acrylic, springs, and into the t-nuts.
View showing acrylic and springs (3 of 4 showing)

Now look at this stack up compared to iteration 1! much more respectable. I haven't even tightened the springs down yet. So now it is acrylic, springs, wood, nylon spacer (to allow for room for the wires and the screws sticking through), heat bed, and my high precision ceramic surface. 

Now if you are asking yourself why did I decide to do it this way? Well remember my 2nd layer of acrylic was extremely warped so I couldn't get the bed level. The four corners were to restricted to each other that it was difficult to adjust. Now the left and the right have independent suspensions. With the less restrictions I should be able to control the leveling easier.

Another major benefit of doing it this way was the tightening it self. Originally (before iteration 1 of new leveling), the spot for a allen wrench was up near the bed it self. I couldn't get the wrench in there, I would have to hold the head with a pair of pliers and turn the nut beneath with a small crescent wrench or another pair of pliers. It was very difficult to make adjustments. To fix this, when I first started re-leveling I just flipped the screws so I could fit my allen wrench underneath and hold the nut with a pair of pliers. It wasn't perfect and still a pain to level. And this is when I noticed how bad the acrylic was. Anyways after all of that and I saw this design idea, I decided to adapt it. No more holding the nut! It is pressed into the wood so all I need to do is adjust the screw with an allen wrench. The ease of leveling is amazing. 

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