These were the measurements I took in my designer notebook.
These were two earlier designs for one of the T-handle holders. The difference between the two is that one of them has an extra hole because I miscounted the number of T-handles and assumed the last measurement.
This was the final design. There are two different heights for the specific T-handle, so I made the design have two different heights. the inside is hollow, to save on filament. There are fillets on almost all of the edges, so that people don't get cut on it's edges. There are no fillets on the bottom so it can print flat.
From the previous designs, not much has changed. The ledge of the taller section has been changed to a 45° slope, and fillets were added to the holes.
These were the designs to hold the other sets of T- Handles. They didn't get printed because I ran out of time to print them. The difference between the two is one is in millimeters and the other is in inches.
This is the design getting ready to be printed by the makerbot. I didn't realize how large the design actually was until I put in into the software. It took about 20 hours to print.
This is the design fully printed. It fit the T-Handles pretty well, although I had to wiggle them a bit to make the T-Handles go through smoothly.
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What I learned
My measurements were pretty close because the tools fit without pushing on each other. The tools were able to stand upright. I learned that I should have made the holes a little bit larger to fit the T-handles better. If I were to make this again I would make it a little bit taller because so the tools would only go to the bottom of the holder.