D Rob Thanks for the video, now I know there are some room for adjustment even when drilling not accurate. There are combination drill/tap/deburr bit that make tapping easy.
Mike Thornbury, I heard different 2020 suppliers have different end hole size. I could imagine with the correct hole size, self tapping screw will give more strength. Does your method require accurate drilling? Could the screw slide before tightening?
@Eclsnowman Thanks, I’m sure I’ll forget some nuts, and I don’t like to have extra nuts in the slot that give strange noise when the frame vibrate. I’ll depend on the insertable T-nuts to save the day.
I’m surprised the tapping method is stronger than the bracket. Need to adjust the design accordingly.
@Mike_Miller Thanks, I checked the spacing is OK. The frame is bigger than necessary. I was tempted to shrink the frame further, but one thing I learn from my makibox experience is the more optimized in space, the more difficult for future mod.
I covered up my Prusa i3 in a big box with no problem, so I assume the stepper will be fine with 20 degree more ambient temp, but I may be wrong. Don’t like the long GT2 belt when putting motor at bottom. Also, use of cheaper GT2 pulley block one belt path, so the motor move above the gantry. Need more consideration here.