AndersJ3

You might want to change the resistenta on the base to 330 ohm. U / I = R.3.3 / 0.01. = 330

Yes, really your comment!?!No, you are wrong, and probably doesn't even understand it.

Iron was expensive, very expensive. So the form gives a long egg (cutting edge) but doesn't use that much iron. That is why swords was so much higher class, as it hed more iron than an axe (or spear).And as christianm5 wrote, it also is useful to hook into the opponents shield. But that I guess was mostly just by the primary design. And as he wrote, Lindybeige channel are good, but there are some discussion between him and historians about interpretations of historical findings. But yes, the videos are entertaining.https://www.youtube.com/user/lindybeige

it will not work with this design.1. The resin is special daylight version, as the light from a phone disply is to low.2. The design uses the display under, insted of top. As the light from the display isn't directed like in a projector. You need the light close to the resin, so it doesn't spread out to much.

why would you want to drive the printer from your computer without an Arduino?It is all about software, so you could. But the Arduino gives better control, and the bugs in the G code interpreter and drivers are all fixed in the GRBL software.Look at it as a device. You dont drive the stepper motors in your printer directly, do you? And using your computer, you could easily end up in timing problems...