Ender 7 Triple Leadscrew Mod

This is my attempt at a z-axis triple screw mod for the ender 7, when used with my other mod (will be uploaded soon) to convert the rear mount to linear rails it should lose little to no height in the z-axis. You will have to rotate some of the parts to the flat side, they are designed to be printed without support everywhere but the recessed nut captures. I use generate support then cover the platter with a support blocker starting 3mm up.

Assembly should be self explanatory from the pictures, for the linear rails start at the top and skip every other hole (should be 10 bolts), the final bolt at the bottom are the two (1 each side) 15mm bolts through the bottom z bearing holders. when setting the two new leadscrews be sure they are not touching the bottom metal plate of the printer so there is no friction. The z axis motor is replaced with a 42-34mm motor to be able to drop 30mm for the extra pulley space to not lose print height, remember to drop the vref so you don't fry the new motor. Not pictured is the z axis motor mount with heat inserts, there are 4 that need to put in the top to mount in the original location.

Print instructions:

Print 1 of every part, 2 of the z rod spacers, 2 z tensioner spacer blocks

BOM:

1 x nema-17 42-34 motor (the higher the torque the better, link to the one I'm using https://www.amazon.com/dp/B07GDBMT1D?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1)

1x 2020 extrusion 300mm

2 x 400mm t8 leadscrews

1 x 420mm t8 leadscrew

2 x 400mm MGN9 linear rails

2 x MGN9C linear rail blocks

3 x GT2-6mm 20T-toothed for M8 pulleys

3 x GT2-6mm 20T-smooth M5 Idler pulleys

1 x GT2-6mm 1180mm length Belt closed loop

2 x 608 Bearings

10 x M5 x 10mm button head machine screws

6 x M5 x 30mm button head machine screws

3 x M5 Hex Nuts

1 x M5 Flanged lock nut

1 x M5x5.8x7 heat insert

12 x M5 2020 T-Nuts

4 x M4 x 15mm Socket head machine screws

2 x M3 x 15mm button head machine screws

4 x M3 x 12mm button head machine screws

16 x M3 x 10mm button head machine screws

24 x M3 x 8mm button head machine screws

22 x M3 2020 T-Nuts

8 x M3 hex nuts

16 x M3 washers

8 x M3x5x4 heat insert

Print Settings:

material: ASA

.4mm nozzle

.25mm layer height

20% infill

4 walls