Here’s a bit more about my build experience. I can’t embed more than one picture so here is a imgur album: https ://imgur.com/a/oudLrPr . Also no links so there is a space after the https.
I started planning the build at the start of June and am still tinkering around with it. It was in a usable state at the end of July, but i had less time after that because i was finishing uni. So the actual planning and building took about 2 months. My total cost came to about 460€, mostly ordering from amazon and aliexpress. Here is a spreadsheet with the parts list and links if anyone in germany wants a reference (https ://docs.google.com/spreadsheets/d/10p0mSdI2XxPyqwIgV7k0LR0sdyUKr9-yUEwBZNssgfg/edit?usp=sharing). The work area is about 600x1200mm, (spoil board currently goes to y 800 because that’s all I needed) which fit on a old tabletop i had.
The build itself went really smoothly. As i mentioned i was hesitant before because i couldn’t print the YZ assemblies in one piece, but went ahead with it anyway. I guess the glue didn’t fully harden before assembly so the parts are slightly shifted. This didn’t matter in the end. You can see the seam to the left of the left linear bearing, where it hasnt shifted yet.
The plastic XZ plates were switched for aluminum ones after I noticed how flimsy they were on the machine. The aluminum plates made a huge difference in stability (who would have guessed). I cut them with a jigsaw, printed template and a buch of filing.
While cutting the strut plates the machine skipped due to loose grubscrews on the stepper pulleys. They were still usable though.
I went with the BTT board with the intention to use Marlin. But couldn’t get the ESP32 wifi module to work with it, so I switched over to Klipper. The controller box has a second story where the raspi sits. I also spent at least a week troubleshooting this thing, which in the end turned out to be a faulty micro SD card.
I thought it’d be cool to have a cnc pendant so i ordered a compatible touchscreen and made the one you can see in the picture. That got abandoned during the troubleshooting and i ended up using the klipper webinterface with my phone, which is also more responsive. So if anyone has project ideas that use a raspi and touchscreen im all ears :).
One problem i still can’t figure out is that the machine can shift about .2mm to the top right after a toolchange/homing. You can see this in the last picture when i cut the guitar fretboard, the slots are shifted over to the right a bit. I think i might yank too hard on the core during a toolchange, which might move the entire gantry? The offset is still there after homing. I cut a second fretboard and was more gentle when changing tools, and didn’t home it after, and it turned out to spec. Does anyone know what could cause this?
. I need to some more feed and speeds tests to find better settings, im currently being very conservative using a 2mm DoC and 1000mm/min with a 6mm endmill.
