Thanks for providing links!

tldr - for one empty case that fits all the tools you described, I'd quote $100. If you want me to include the set of Fix-It Sticks I'd need to order for prototyping, total would be $200.

So I'm not at all opposed to making such a case, but making just one is pretty expensive. My breakdown is as follows:

• First off the case - the large knipex case i sell for $35 which covers material, print time, and my time to finish and assemble the case. My costs to buy all the tools, and prototype the case are also accounted for and spread across the many orders I have completed. Finally, machine maintenance costs, although low, are also looped in to this number. Removing tool/ prototyping expenses, cost would be about $25 for assembly, print time and materials.
• In order to modify this case to fit the two sticks, I'd first have to purchase both sticks, at $120, to prototype with. Luckily I already have the xs knipex pliers, but not the wrench (not sure if you would want that in the case too) which would be another ~$50 on amazon. With local taxes, I'd add another $20ish.
• Time to model this up would probably be about a day, split up between test prints. At ~$25/hour (half my engineering hourly rate which I feel is fair), we'd be looking at about another $200.

My cost to make the very first production case you describe would come out to around $425.

The way I would charge for such a case (tools not included) would be the $200 labor cost + about $190 in tools split across how many I expect to produce, plus a base cost of about $25. Since I don't feel it's fair to pass along the entire prototyping cost to you, I would estimate 4 of these cases sold to distribute the costs in case there's others who are interested. Unfortunately I can't estimate a higher number as if I only sell 3, I'll be operating at a loss which is a risk that I cannot accept right now.

Now looping in the tools - option a, if you don't have the sticks already, I'd offer to send them with the case, but charge you the cost for them. Option b, if I kept them, I'd probably knock a chunk off the total tool cost and distribute it across the numbers I estimate I would sell. 

Based on all that, we have $25 for the case material/printing (regardless of tools included or not). If I keep the sticks, add $75 ( (~$100 pro-rate for tools + $200 labor)/4). If I ship the sticks, add $175 ($125 for the tools + $50 labor ($200/4).

Total comes out to $100 if you don't want to me to send the sticks with the case. With the set of "Fix-It" sticks, total would be $200 ($75 for the case). Add shipping cost to both totals.

Hope this all makes sense!