I did my first form 1 can on this mini CNC
SainSmart Genmitsu 3018-PROVer Desktop CNC Router Machine with GRBL Offline Control, Limit Switches & Emergency-Stop, XYZ Working Area 300 x 180 x 45mm, Wood Carving Machine https://www.amazon.com/dp/B07ZFD6SKP/ref=cm_sw_r_apan_glt_i_34C4GGPCHRNR0EG7TNEN?_encoding=UTF8&psc=1
I used the sharp bit that came with the kit and it did an ok job, I have been told it does much better with a diamond drag bit, the GG3 should be able to get similar results. You just need to make your own jig.
The 3018 was a little easier as it was top down milling and easier to align on a curved surface.
I just used longer bolts and some 3D printed brackets to hold the can in place.
The reason you see a lot of used ones for sale is because people get fed up with them and give up. A used printer is almost always being offloaded because it's either broken, or they just couldn't figure out how to get it to work well.
The go-to recommendation used to be the artillery genius, but they discontinued the original for a more expensive "upgraded" version where the upgrades are completely useless. It's still a very good printer, but the new $350 price tag is a bit hard to swallow.
If I was going to buy one printer for gun stuff and was trying to keep it as inexpensive as possible, I'd probably go with a sunlu S8. It's only marginally less janky than an ender, but it's a lot bigger and pretty capable.
I think you probably read my old thread asking about this . I think the most versatile way would be for them to release an Appimage which is cross platform for all linux distros. I run Prusaslicer as an appimage since the latest updates to PS seem to take awhile to hit the Fedora repos. I'm unfamiliar with how to create an appimage but think it's just a matter of wrapping your existing build into the package https://appimage.org/
I'd love to dedicate an RPi4 to DDCut and run a small 7" touch screen to navigation.