When I started on the Voron project, I didn't realize that the printhead assembly that holds the hotend and cooling duct can be swapped out fairly easily.
It's just a matter of backing out two bolts to flip the fan up, two bolts to free the printhead, and disconnecting two wiring connectors.
The V6 on the monoprice mini select was having underextrusion issues with PLA.
After some testing and research I believe that the PLA is sticking to the inside of the stock V6 heat break when retracted far enough to pull melted plastic up that far.
The extruder on the mini isn't good enough to overcome the resistance. If I give the plastic a pull and a push things start flowing again.
I reduced retraction to 2mm. The problem went away, but now I have stringing.
So I ordered some ptfe lined heatbreaks. Also ordered one with a 4.1mm bore that allows the bowden tube to be all the way against the nozzle itself, but have to wait for that one to get here from China.
Where this pertains to the Voron having swappable printheads is that I now plan to make a separate printhead for PLA and maybe a third with a larger nozzle.
Heater cartridge and thermistor will need to be the same type on each since those are set in the firmware.
For anyone planning a future build, it will require two more M3x40 and two more M3x16 cap head bolts per printhead (in addition to the extra hotend/thermistor/heater).
The V6 clone from Trianglelab makes it fairly cheap to add an extra printhead.