These were used on the Wanhao I3 Duplicator Plus, all the same high. In this last batch I took some 3/4 x 1/8 nut washers from Ace and glued them to the underside next to the bottom bracket with the ends of the upper tubes sticking out of the corners. Makes a much stronger base than the original springs, even after adding spring plates and washers. The only time I have to level now is after I remove the glass to get rid of the dirt. The price seems high for what they are, but it will cost a lot more to set up to play your own. I had no problems with the material even at a bed temperature of 70-80 C with flat glass with ABS. Runs it on two printers. I replaced the stock Z-axis stop switch mounts with adjustable ones. I may need to do something before adding them, they're probably not exact height substitutes.
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