Hello, no this is not normal nor common. Make sure you are not pinching something like the motor cable when closing it. Otherwise make sure to use the recommended print settings as well as genuine hotend.

Yes! The reason is to reduce noise ;)

I don't know what are those. Could you share me a picture via discord, twitter or GitHub?

Yes for MK3 but on MK2S and 2.5S the spacers are attached to the be and the bed is screwed from the bottom.

It is better to select the profile you like to use in the list

My M5 holes are set at 5.3mm and this has been tested for several years with M5 screws. Make sure to calibrate your extrusion multiplier with our guide before printing the parts (and per spool). Check our guide here: Extrusion multiplier and filament diameter

Make sure to calibrate your extrusion multiplier with our guide before printing the parts (and per spool). Check our guide here: Extrusion multiplier and filament diameter

Make sure to calibrate your extrusion multiplier with our guide before printing the parts (and per spool). Check our guide here: Extrusion multiplier and filament diameter

This is the case if you build an non-official frame and they have used wrong t-nuts. Official t-nuts are flat for this reason.

It might change between spool (even sometimes from same brand, type and color) so I recommend to do it