B-Struder - Bowden extruder with MK7 gear + 623ZZ bearing for 1.75mm filament by Barrocas

Last crawled date: 3 years ago

This Remix is to use a MK7 gear + 623zz bearing.
Beware that the motor spindle needs to be long enough if you want it to support the MR105ZZ bearing, I estimate that it needs to be at least some 20mm long, or more.
By 3D calculations and measuring, I estimate that on my motor (Wantai 42BYGHW811L20P1-X3 2.5A 1.8ºstep) this version would not fit as nice as the 40T design, because of the taller gear that puts the MR105ZZ bearing almost popping out off the motor axle. The bearing holder now has a lip to better secure the bearing.
I didn't test this, since I don't really have this gear.
I made this MK7 version for users who have this gear.
The main issue I noticed in the design is that the MK7 gear is longer that the 40T gear I use, so it occupies more of the available motor spindle height, leaving a shorter space to fit the top MR105ZZ support bearing.
If you try this, please give some feedback if it works properly.
Please see the source file for assembly instructions and pictures.
The differences for this one are 2 different printed parts, the arm and the motor mount, to adjust to the bigger MK7 gear and smaller 623ZZ bearing.
The MR105ZZ support and side locking lever are the same (as in the source design for the 40T gear), they just need to be fitted with an extra 2x M3 large washers, between them and the motor mount (pictured in red), to compensate for the taller MK7 gear.