A10 Y-axis rail stabilizer block

This is a quick and dirty fix for the relatively unsupported Y axis rail for the Geeetech A10 printer. The printer was designed with a single 2040 rail sitting crosswise on top of a square 4040 rail, leaving a 20mm square bolt pattern holding the rail, carriage, and Y stepper motor. This allows a lot of vibration (ring) as well as skipped steps due to high mass jerks when printing large or multiple objects at decent speed, no matter how tight the Y belt.

To help alleviate this, I simply designed a rectangular block with two linear extrusions which fit inside the v-slots of the 4020 rail, and sit flush against the flat surface underneath the printer, such as a table, etc., basically "legs" for the rail.

Two are needed to fix the issue, one placed in front and one behind next to the stepper motor. When the carriage accelerates in the Y direction, the two legs prevent the rail from teeter-tottering on the 4040 base rail.

Note, the height was determined with calipers, taking into