PVT Progress Update
I am heading out of town in the morning (in a few hours really) for a few days so I wanted to give everyone an update on how PVT is progressing before I go - this will be a short update for that reason.
Update on PVT Changes
Enclosure - The acrylic enclosure will remain the same material - our testing continues to show it works well and the addition of the previously mentioned enclosure fan activation temp sensor allows us to ensure it will not be an issue even with full enclosures running for long periods.
Other Parts - The injection molded parts corrections we mentioned last time are almost complete and we will be sticking with ABS for the parts. We are also waiting for the final PVT 3D printed parts (to match the circuit board changes mentioned below) and a few of those parts we are sampling as injection molded parts as well - they are tricky parts to injection mold so we'll go with whichever method gives us the best part without too many rejects.
Circuit Boards -
PCB Heating and Current Setting - We have made the design changes to address these two issues and tested in house prototypes of each, we're now waiting for the new assembled boards that will be the PVT boards if they don't have any issues.
Other Changes - Since the last update we've also changed a few of the connectors on the boards that either could get in the way and cause a jam in the case of the head unit (changed to vertical connectors for the RJ45 and DC JACK) or made assembly at the factory very painful (for the heated bed, changed to surface mount RJ45 so they don't have to mill the aluminium plate to allow for the through holes). These changes are both in the new PVT boards we are awaiting.
Expansion Changes - We have removed the LASERGND pin from the expansion header, using it via the expansion header proved to be impractical given the amperage draw that might be placed on it and the position on the board. That pin is still accessible via the RJ45 cable that runs from the main board to the head unit. - The LASERGND pins have been replaced by additional 12V and GND pins on the expansion header. The rest of the expansion header pins are now locked in.
Other PVT Issues -
We are still waiting on just a few parts suppliers, cases where we've had to find an alternative supplier and are now waiting to verify their products are identical (or identical enough) to what we originally sourced.
We still need to finish the design of the packaging - or rather ask the packaging factory to do so - we've already given preliminary specs and we aren't doing anything fancy (a plain flat pack box with dividers and a few sheets of foam - shipping this safely has been something we've kept in mind through the design rather than relying on packaging alone), but they basically need a PVT set to finish it and then can produce the packaging in a day or two since we are not using any fancy formed inserts or anything like that.
Don't forget: Want to help us with some code? Check out the bounties here: https://github.com/digistump/BuildOne/issues
That's all for tonight, but I look forward to having most, if not all, PVT parts to show soon - and we will provide another update regardless around late next week/early the following.