Step 1: To start this 3d modeling tutorial open or rest Max. Form Create, Geometry create a Box with the Length, Width and Height of 10cm and change Length, Width and Height Segments number to 2.
Step 2: In the Modify tab from Modifier List apply a Spherify modifier and convert the box to Editable Poly. Right click on the screen, Convert to>Convert to Editable Poly.
Step 3: From the Modify tab select the Vertex selection mode, go in Front view(press "V" on your keyboard to switch between viewports) and select the 2 vertices i've marked below. Click on Percent Snap Toggle to activate it and using the Select and Scale tool scale down the vertices in X axis direction until you see 60 in the bottom of the screen.
Step 4: Now in the Back view do the exact same thing only this time in the Y axis direction.
Step 5: In selection rollout menu select Edge and select the edges i've selected below holding CTRL.
Step 6: With the edges selected click on the little box next to Chamfer in Edit Edges rollout menu. Chamfer the edges with an amount of 0.25cm and 1 segment. Click the check mark for OK or click the plus sign(apply) because we will chamfer the edges again in the next step.
Step 7: With the edges resulted from chamfer still selected apply another Chamfer only this time change the amount to 0.05cm.
Step 8: Continuing with this 3d modeling tutorial from the Modifier list apply a Turbosmooth modifier and change the Iterations to 2.
Step 9: Now apply a Spherify modifier.
Note: You should exit selection mode if the Spherify modifier doesn't work.
Step 10: To continue this 3d modeling tutorial apply a Edit Poly modifier.
Step 11: In Edit Poly modifier select the Edge selection mode and make a Loop selection like i've did below. Select one edge and click on Loop.
Step 12: We now must convert our edge selection to Polygons. To do this simply hold down CTRL and click on Polygon icon(red square) in selection rollout menu.
Step 13: To grow the selection click Grow 2 times.
Step 14: Now click on the little box next to Extrude to extrude the polygons with an amount of -0.025cm. Change the extrusion type to Local Normals and click the check mark for OK.
Step 15: For the final step of this 3d modeling tutorial just add another Turbosmooth modifier.