MakerGear M2 bed support spring

This curiously shaped device prevents hard drops of the Z stage on the MakerGear M2 when the motors are turned off and disengage. It is designed to have enough flexibility to gently slow the Z stage to a halt, but not prevent the Z stage from being pushed all the way to its maximum extent if needed. It slips over the M2's frame base and snaps into place. It is designed to be printed in PETg, which has the right amount of strength and flexibility for the spring's thickness, width, and curvature as designed.

The original version worked but was incorrectly sized, and so has been deprecated and removed. There are now three versions: springcurve2, springcurve3, and springcurve4. Springcurve2 installs with the curve pointing toward the back; in this position the curve must be made narrower and is therefore stiffer. It has not been tested. Springcurve3 is a re-creation of Michael Hunter's Z axis return spring (http://www.thingiverse.com/thing:615104), but with the ability to clip o