MTvplot (vertical plotter)

After i discovered the wonderful vertical plotter made by rincey12 and his awesome diy-manual (@ makerblog.at) i decided to make a quite similar design from scratch (and try to improve some known problems by throwing in some bearings).

For the gondola-arms i printed them @100% infill and drilled the small holes (for the cord and the set screws to secure it) afterwards to gain some weight and stability. My whiteboard-markers are ~17mm in diameter, so i used a 20mm aluminium tube as gondola-core and some set screws to be able to use smaller pens (whithout changing the mid-point). Between the bearings i used a printed 0.5mm spacer (some more sizes included).

As i wanted to try it on my already mounted whiteboard, i made some 'front-side' holders for the stepper motors (to quickly screw them to your wall-of-interest). The gears are sized for a roller blind cord with a sphere diameter of 4,5mm and a distance (mid-sphere to mid-sphere) of 12mm.

To finally operate it, i used the fan