Just downloaded and took a look, for a quick check.
I think this is second board i see with inverting buffer on mosfet gate, i hope you realize that the default state when the pin is undriven, is to have the fet conducting, which means default state cand easily turn into a mess. If uC doesnt turn on, gets stuck, doesnt reset properly etc, then = meltdown. Rather dangerous, because some of them arent even failure modes, e.g. a watchdog wich may just wait for a user reset. IMHO, add a pnp or else may take the inverter away so default, undriven state is turned off - not conducting.
I think D2 is meant as reverse polarity protection coz its labeled 4004 not tvs, and a 4004 couldnt do anything else there. But it will probably blow before Fuse2 blows, coz is rather weak for 1A. Then perhaps may need a bulkier diode there, dc rating A > fuse Amps, which is probably going to be a bigger physical diode.
I think fet Q2 is for bed, so 10 amps there and the track width 1.4~mm is kinda low. Using track width calculator in pcb tools says 10A is min 3.7mm track width for a +30 deg rise.
If it would have just a bit thicker traces would be good for DIY. But thats just me :)
Pololu modules: pullup for sleep + reset should be max 4k7 (see pololu site comments for latest module drv8825) so perhaps change 10k to 4.7k or even lower like 3.3k perhaps better coz there is only one. Also 220nf ceramic caps decoupling near each module i think that would be a good recommendation.
Motor connectors perhaps need more space, just heads up that in kicad SIL ones are narrower than pinhead... and physical ones.
Min max headers and 2 buttons are under the board, or board is on the other side? Power i found a page that says "3.15V-3.3V external powering, or from USB..." which made me a bit confused if vin is 5v or 3.3v so probably double check, i cand find a fast enough answer for myself.
Otherwise looks quite nice. These days I am routing an lcd board for connection via I2C, also in Kicad and will work with 3.3v, so there is at least one addon for it. In a week or two it will be under RDB feature page. Another set of electronics which i am also probably the only one to use them. Btw, consider making a page for it on reprap wiki, at least for reference.
I think this is second board i see with inverting buffer on mosfet gate, i hope you realize that the default state when the pin is undriven, is to have the fet conducting, which means default state cand easily turn into a mess. If uC doesnt turn on, gets stuck, doesnt reset properly etc, then = meltdown. Rather dangerous, because some of them arent even failure modes, e.g. a watchdog wich may just wait for a user reset. IMHO, add a pnp or else may take the inverter away so default, undriven state is turned off - not conducting.
I think D2 is meant as reverse polarity protection coz its labeled 4004 not tvs, and a 4004 couldnt do anything else there. But it will probably blow before Fuse2 blows, coz is rather weak for 1A. Then perhaps may need a bulkier diode there, dc rating A > fuse Amps, which is probably going to be a bigger physical diode.
I think fet Q2 is for bed, so 10 amps there and the track width 1.4~mm is kinda low. Using track width calculator in pcb tools says 10A is min 3.7mm track width for a +30 deg rise.
If it would have just a bit thicker traces would be good for DIY. But thats just me :)
Pololu modules: pullup for sleep + reset should be max 4k7 (see pololu site comments for latest module drv8825) so perhaps change 10k to 4.7k or even lower like 3.3k perhaps better coz there is only one. Also 220nf ceramic caps decoupling near each module i think that would be a good recommendation.
Motor connectors perhaps need more space, just heads up that in kicad SIL ones are narrower than pinhead... and physical ones.
Min max headers and 2 buttons are under the board, or board is on the other side? Power i found a page that says "3.15V-3.3V external powering, or from USB..." which made me a bit confused if vin is 5v or 3.3v so probably double check, i cand find a fast enough answer for myself.
Otherwise looks quite nice. These days I am routing an lcd board for connection via I2C, also in Kicad and will work with 3.3v, so there is at least one addon for it. In a week or two it will be under RDB feature page. Another set of electronics which i am also probably the only one to use them. Btw, consider making a page for it on reprap wiki, at least for reference.