EZ Access Extruder R2

-fan size options: 4010 or 4020 hotend fan with 5015 or 5020 print fan
-all M3 bolts are in increments of 10, 20, 30, 40mm
-replaced all hex nuts with square... 5.5 x 5.5 x 2.4mm space for deez nuts
-easier assembly than original. cables to extruder go under bottom X axis rod. motor, fans, hotend and probe can attach at the end without disassembling
-longer extruder loses 12mm print height but  you gain it back with new z_axis_bottom and top. uses same rods as original, shifted up to gain unused space
-PTFE is now same as MK3S+ 42.3 mm long, chamfered. instead of reaching gears.

Assembly Instructions
note: filament sensor assembly is same as original. Use original lever and part with steel ball inside from Prusa. Those are only 2 parts not included in files list.

1) "x_carriage" zip tied to top linear bearings like normal
2) "extruder_body" bolted to "x_carriage" with (2) 30mm bolts in different location
3) "motor_plate" attached to motor with (2) 10mm bolts
4) motor+"motor_plate" attached to "extruder_body" left side with a 40mm bolt
5) "extruder_idler" is slotted with 40mm bolt. add 40mm bolt with tension spring as normal
6) attach PETG "fan_shroud" and "fan_support" to "extruder_cover", attach print fan
7) add "fan_duct" with (2) 10mm bolts to "extruder_body"
8) attach "extruder fan" to "fan_duct" with (2) 20mm bolts
9) attach probe and "fs_cover" to top of extruder
10) place hotend in "extruder_body" and attach "extruder_cover" with (2) 30mm bolts
11) attach "x_carriage_back" to "x_carriage" with (3) 10mm bolts
12) place cables in PETG "cable_holder" and attach to "x_carriage_back" with (2) 10mm bolts
13) zip tie cables as normal

Changes made to each part:

"extruder_body" bolt placement changed and has been extended by 12mm in order to have easy access to the hotend by removing just 2 bolts from new "extruder_cover"

"extruder_motor_plate" has be cut down for hotend easy access feature. The part cut away has been added to "extruder_cover" to hold the top of the heatsink.

"extruder_idler" (optional use) changed from hex to square nut and uses a 2cm bolt (add grease) and square nut instead of the metal rod.

"extruder_cover" uses 2 bolts for "fan_shourd", 2 bolts to attach to "extruder_body" and pushes against the top of heatsink and motor plate to tighten everything. No longer attached to extruder fan.

"x_carriage" cut down and bolts in different places, square nuts instead of hex.

"x carriage_back" does not required cables to be fed through a hole but instead clipped on with the new "cable_holder" with (2) 10mm bolts.

"cable_holder" print in PETG. can be attached after all other parts.

"fs_cover" easier to slot in filament with bigger hole and arrow is bigger.

"z_axis_top" and "z_axis_bottom" extended 12mm for lost z height, no new rods needed.

"fan_duct" new print that moves 40mm extruder fan outward at an angle, also hits a limit switch for MK2 and MK2.5 printers.

"print_fan_support_5015" remade to hold entire fan at 30 degree angle.

"fan_shroud_5015" or 5020 version, 2 flat spouts pointed directly below the nozzle, angled so air is pushed backwards when flows collide. attached with a bolt on each side.

"spool_holder" use 30mm bolts, go though z top parts, frame, then in this part. self threading. original spool holder collides with this extruder.

"hex_key_drill_adaptor" use drill or screwdriver

edit: 

[10. 11. 2021] parts revised (R2). Motor plate is now separately secured to extruder_body with two 10mm bolts and nuts. extruder cover is changed to match.