Prusa i3 MK3 TPU Micro Spring

The bed on my Prusa i3 MK3 had around .5mm variance according to my mesh level testing (see: https://github.com/ff8jake/g81-to-heatmap ). I wanted a way to level it out using the nine screws in the heatbed, and ended up settling on these. See https://shop.prusa3d.com/forum/original-prusa-i3-mk3-f30/-testers-needed-tpu-micro-springs--t15061.html for more information!