Bambu extruder gear + adjustable tensioner mod for Lemontron

RECENT UPDATE: Modified tensioner screw cap and added shortened Lemonstruder pieces for durability and more range of adjustment

I had a lot of trouble getting a K1C gear that could grip filament well enough for my rev E lemontron. I bought a Bambu extruder gear set, since it has a similar size, and found it performs much better for me.

If you don't have issues with the K1C gear that the stock rev E Lemontron uses, the Bambu gears are unlikely to give you any performance upgrade! 

This mod also adds a tensioner screw, design curtosey of Ole Brouer from the Lemontron discord server.

YOU WILL NEED: 

1x Bambu extruder gear (Specifically the one from the tensioner arm on the bearings)

M3 shims and washer (incl. in Lemontron BOM)

1x 8mm countersunk M3 screw (incl. in Lemontron BOM)

1x M3 screw, preferrably button/wafer/cap head 10mm length

1x M3 nut (incl. in Lemontron BOM)

1x Lemontron Rev E

ASSEMBLY:

 - Print parts with Lemontron recommended settings EXCEPT for the tensioner screw cap - print this with 1 perimeter and 999 bottom layers.

 - If your Bambu gears come pre assembled, take the filament gear out from the plastic assembly using flush cutters. The gear you want is the one with the teeth leaning from left to right with the bearings in it.

 - Push filament gear into printed inner gear. It should be a snug fit and not wiggle around.

 - Push inner gear assembly into (stock Lemontron) outer gear. It should be snug too. Otherwise, you can use a teeny litle dab of CA glue to secure them.

 - Put 1 washer onto the motor screw post and then enough shims so that the gear can spin freely without the bottom touching the rest of the motor

 - Put gear assembly onto the motor screw post

 - Since a screw hole is covered by the new top plate, you will need to countersink it so a new screw can go in. 

- Screw 8mm countersunk M3 screw through midplate into motor. It should be flush.

 - Assemble the tensioner - put M3 nut into tensioner hole and make sure it is secure and won't come out. Use CA glue if necessary but make sure none of it wicks up into the threads!

 - Screw 12mm M3 screw into it from behind

 - Place tensioner screw cap on the end of the screw

 - Put Lemonstruder spring bearing assembly thingy into place and put the top plate in place

 - Remember to recalibrate your e-steps! (current esteps * (actual extruded distance/requested distance))