Hello,

A club at my school that I am leading is building a RepRapPro Mono Mendel, and we are sourcing the parts for the 3-color upgrade ourselves. I have been able to find everything except for the "double coil spring washers" mentioned on the RepRap Wiki page.

The suppliers that I was able to find (Freeway Corporation and Shakeproof Group) are not interested in selling small quantities of parts, and all other online vendors that I was able to find do no stock the correct sizes. Does anyone know where I could find these parts in the required size (M3, or 1/8in)?

I also had the idea of simplifying things by substituting the washers for compression springs. There are a large variety of springs at www.centuryspring.com, and after a brief search I was able to find one that seems to fit roughly the same envelope as the double coil spring washers: Spring Specifications. Does this sound feasible?

McMaster Carr has all kinds of springs and belleville spring washers. Bellevilles can be stacked in parallel or series to give different force and spring rates.

OK, thank you!