2020/2040 External Driver Box

## External Driver Box for 2020/2040 extrusions.
Designed for the TMC2100 driver upgrade for the Prusa I3 MK2S/2.5:
https://vmod.space/product/prusa-mk2s-ext-driver-board-rev2-3/

This is a remix to enable direct mounting to the rear of a 3D printer which uses 2020/2040 extrusion like the fantastic Prusa Bear:
https://github.com/gregsaun/prusa_i3_bear_upgrade/tree/master/full_upgrade/for_mk2_mk2s

The new design utilises 2 x 40mm fans in a push/pull configuration to increase airflow and l