Originally Posted by SD2
I think that if you can, you should try to find where the extra weight comes from, as 78 grams would be way better than the 88 you'd have now. I think for marketing, or for a video of the astrum, you should also show the lightweight shell with holes in it and showcase it's low weight, because then it could ride the hype of lightweight mice a bit.
Also, if I'd 3d print a part for my astrum, I wouldn't have the original coating, so is there anything I could do to get the same coating on those parts too?
The coating is a bit tricky, but it mostly uses standard colour codes for car paint. So you can order cans of it from ebay, or take it to a paint shop and have them spray it (or they might also be able to supply you with a colour matched paint, or at least give you a paint code which is similar).
A lot of the colours are Audi colours, like Nardo Grey, Ara Blue, Glacier White, Panther Black (but most blacks or whites will work with these), the red is Alfa Romeo Rosso Competizione Tri-Coat, the green is a Rover colour, have to look it up (can't remember it off the top of my head). The only problem colour is the purple, that was colour matched from some vinyl I liked.
To get the matte effect, try and get some matte clear coat, and for extra matte effect spray a thin final coat from a further distance so it kind of dusts it, if the coat is really wet then it'll come out more glossy.
Originally Posted by charlieputh
oh great what material should It get printed on for the best weight and feel?
I usually just go with ABS, but you could use resin which is usually more accurate and needs less finishing (sanding etc). There are some really nice printers coming out which make parts really cleanly. Its one of those things where it depends what you want from it. ABS is really tough and it behaves a lot like normal mouse plastic (since it's the same material), and it can be sanded down to a really smooth surface. Resin can be very different, some are not as rigid as ABS, but some are even more rigid (almost brittle). You can get very accurate prints with polyjet resin but its super expensive. Resin tends to be a little bit heavier than ABS, but not by much.
Originally Posted by qsxcv
it can't be that hard to figure out what made the difference...
It looks like its coming from a lot of places, pretty much everywhere, unfortunately. Lots of little changes adding up.
- The PCB was redesigned, and this is the first time I've seen it. Its a much better PCB than the original, but it has added a fair bit of weight, due to it having full copper pours and lots of vias added, also the front connectors are more robust. The thing is I do like it, its a good PCB, I don't really want to change it
- The cable and magnets do weigh a bit
- There are also some areas where the plastic needed to be made thicker to reduce surface imperfections, but this has added some weight.
I am making a spreadsheet at the moment to see all the differences, but I think its going to be difficult to change it by much. I think probably the main factor is the adjustable sensor position, because it causes the PCB to be quite extensive, it could probably have been a fair bit lighter without that. It was ok at first, but after all the changes during tooling, the mouse really needed more wiggle room with its weight, which the adjustable sensor has taken, if that makes sense. But it does also mean that because the sensor is separate from the MCU PCB, the PCBs can be adapted to more shapes, so it does help out with modding.