FreeCAD model #3
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added 5 commits
July 6, 2023 16:00
This means it protrudes further from the wall. This is to allow for larger tolerances. The issues this expects to solve are: - Case won't close because LCD tabs hit the 24V -> 5V converter - LCD won't work because screen is pinched against the case - Case won't close because there's not enough clearance for the LCD pins
The previous model was done in OnShape, which is a propritary web-based platform. It is easy to use, and they give out free accounts for personal use, however the free accounts could be discontinued at any time, leaving us with only the .stl files. If that happened, making changes to the model would be very difficult. By recreating the model in FreeCAD, we don't have to worry about this. In addition, this makes the case 4mm taller (protruding from the wall further) in order to solve some issues we've seen, such as: - Touchscreen not working because the case is too short for the LCD pins - Case won't close because the LCD tab collides with the AC/DC converter This model should match CoverOneSnap2H-taller.stl in every functional way. There are tiny cosmetic differences. Finally, it will be easy to make modifications. For example, there is a report of some models of LCD touchscreens being slightly thicker. With the FreeCAD model, changing the space for the screen is just a matter of changing the length of the LCD_tab_posts_pad. Similarly, changing the height again, would just be a matter of changing a single constraint in the Side_sketch.
There is now a spreadsheet which will control the interior height of the case and the LCD screen's thickness that the tabs need to fit.
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I remodeled the case in FreeCAD, as mentioned in this thread. I've tested out the latest iterations and verified that they work for both the silent and the clicky versions of the HestiaPi ONE.
People who are comfortable working on OnShape are welcome to continue using that model as a base when making modifications. The FreeCAD version is for people who are comfortable using FreeCAD and perhaps don't have any experience with OnShape. It's also a hedge against OnShape someday removing their free accounts and it being more difficult for new contributors to jump in and make customizations.
Compared to the OnShape model, the FreeCAD model is slightly taller to address issues that I've had with cases for the clicky version being too short. The PCB sits a little higher with that model and it was causing the case to fail to close.
I also have a commit in here that updated the OnShape model to make that slightly taller in order to make it fir the Clicky edition of the board. I did not print that, so I can't verify with 100% confidence that it's perfect, but it was a very simple modification in OnShape and my reproduction which has the same height works fine. So I am very confident that it's fine, albeit technically untested.