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Yay, you can do 3d on your calculator! :D (i may make a 3d game soon)

Thanks to Antarctus for the draw line function

from math import cos,sin,pi
from kandinsky import *
from time import sleep

MODEL=[]

def cube3d(x1,y1,z1,x2,y2,z2):
  line3d(x1,y1,z1,x1,y2,z1)
  line3d(x1,y1,z1,x2,y1,z1)
  line3d(x2,y1,z1,x2,y2,z1)
  line3d(x1,y2,z1,x2,y2,z1)
  line3d(x1,y1,z2,x1,y2,z2)
  line3d(x1,y1,z2,x2,y1,z2)
  line3d(x2,y1,z2,x2,y2,z2)
  line3d(x1,y2,z2,x2,y2,z2)
  line3d(x1,y1,z1,x1,y1,z2)
  line3d(x2,y1,z1,x2,y1,z2)
  line3d(x1,y2,z1,x1,y2,z2)
  line3d(x2,y2,z1,x2,y2,z2)

def line3d(x1,y1,z1,x2,y2,z2):
  point3d(x1,y1,z1)
  point3d(x2,y2,z2)

def point3d(x,y,z):
  MODEL.append([x,y,z])

def line(x1,y1,x2,y2,c):
  w=x2-x1
  h=y2-y1
  if abs(w)>=abs(h):
    d=h/w
    for i in range(0,w,(w>0)*2-1):
      set_pixel(x1+i,y1+int(d*i+0.5),c)
  else:
    d=w/h
    for i in range(0,h,(h>0)*2-1):
      set_pixel(x1+int(d*i+0.5),y1+i,c)

def render(cosy,siny,cosz,sinz):
  fill_rect(0,0,320,222,(0,0,0))
  draw_string("Full engine coming soon...",30,202,(255,255,255),(0,0,0))
  for i in range(0,len(MODEL),2):
    x1=MODEL[i][0]
    y1=MODEL[i][1]
    z1=MODEL[i][2]
    x2=MODEL[i+1][0]
    y2=MODEL[i+1][1]
    z2=MODEL[i+1][2]
    #Rotations
    x1,z1=yturn(x1,z1,cosy,siny)
    x2,z2=yturn(x2,z2,cosy,siny)
    x1,y1=zturn(x1,y1,cosz,sinz)
    x2,y2=zturn(x2,y2,cosz,sinz)
    #Projections
    px1=int(x1*100/(z1+300))
    py1=int(y1*100/(z1+300))
    px2=int(x2*100/(z2+300))
    py2=int(y2*100/(z2+300))
    line(px1+160,py1+100,px2+160,py2+100,(255,255,255))

def yturn(x,z,cosy,siny):
  return z*siny+x*cosy,z*cosy-x*siny

def zturn(x,y,cosz,sinz):
  return x*cosz-y*sinz,x*sinz+y*cosz

cube3d(-100,-100,-100,100,100,100)
yrot=0
zrot=0

while True:
  cosy=cos(yrot)
  siny=sin(yrot)
  cosz=cos(zrot)
  sinz=sin(zrot)
  render(cosy,siny,cosz,sinz)
  yrot+=pi/90
  zrot=sin(yrot)
  sleep(0.01)