This is a Strumtiger Dice Tower, or Panzersturmmörser. It works fairly well for 17mm dice. If you just want to use it for 12mm dice (standard wargame dice), print it at 80% size.
V2 has a high engine deck wall so you have to be fairly close to see the numbers on the rolled dice. V3 has a low deck and you can see the results from the other side of the gaming table, of course it looks a little odd with the low engine wall..
This is based on the excellent 1:200 Strumtiger of m_bergman. I have also included a Roof Plate and Engine Deck. Why you ask? Well, when you don't want a dice tower, but just a Strumtiger model, put the Roof Plate and Engine Deck on. The first image shows a 3/4 print with the these in place and a full size print with these just to the right.
Now the superstructure of the dice tower does not need supports to print. Of course the belly plate, main gun and the tracks do, So make sure to support block the interior of the dice tower, i.e. where the dice roll. If not, you will find you longish print filled to the brim with supports that are very difficult to remove. When I do that by mistake I just put on the Roof Plate and Engine Deck and say I meant to print it as a model, not a dice tower. :) I now have about 15 Strumtiger models that way :(.
The six Strumtiger image shows some of these and other working prototypes.
Developed on the M3D promega.
3/14/2019 - The Engine Deck Plate was a really tight fit, some I trimmed it a little on two sides.
3/30/2019 - Revised the dice path so it prints much cleaner with no supports. You still need supports on other areas of the model. I also made some minor changes to the engine deck and roof plates.
6/9/2019 - Added a low deck version so you can see the results from across the table.
0.35 mm and 0.5 mm laters
Amazon Basic PETG
Gray or Black
Support block the interior of the dice tower above the belly plate, otherwise the dice tower will be filled in with supports where you least want them. It doesn't need supports there. Yes, it will be a little rough on the underside of the middle dice tower ledge, but that won't stop the dice rolling and you can only tell by feel. If your printer isn't quite dialed in, you can block most of the interior supports for the tower and leave the outside 2mm, which would be easy enough to remove.
You could print this by by just changing the minimum support angle to 70, but the front part of the tracks won't look so good.
If you print the roof plate, make sure to trim off the crane support on the back, otherwise it won't fit flush.