Z-axis lower brace for Zonestar P802QR2

This is a remix of nilocwng`s excellent Z-axis brace for Zonestar P802QA. I have increased the thickness of the base plate a little, extended the forward webs and threw in a few rads. This and the upper Z axis brace make a very big difference to the rigidity of the assembly and reduces wobble on the Z axis. Would recommend using it with the remixed upper brace here: https://www.thingiverse.com/thing:2936787 Collection of all my upgrades for the Zonestar at the following link: https://www.thingiverse.com/thing:2936870