doit T100 basic chassis body

edit 18 mar
added jack_stand, a simple stand that clips into holes underneath and raises the tracks off the ground for debugging motor code without taking off.
added photo with track_top fitted

edit 10 mar
added track_top, plate over tops of the tracks, piece is over 200mm long so needed to be printed at a 45 degree angle on my 200mm bed.

edit 8 mar 2019.
added track_guard which cover the front of the tracks, need 2, front and rear, no support needed and I used a 0.6mm nozzle.
I am using 3 x 18650's with keystone battery terminals, the wiredx3 from https://www.thingiverse.com/thing:3377921

So it is easy to replace the batterys I fitted this into a simple tray, battery_plate, wanted to leave space front and rear for sensors so fitted width ways near the centre of gravity, using a simple nodemcu-motor-shield and made a placeholder for the moment, shield_rack, I want to change to an ESP32 but do not currently have one in the right form factor.

.. next up track linear gu