Alpha-4 Release - ~11 new parts and NEMA17 support

README.md

@@ -5,15 +5,19 @@ by Zruncho and DoomCube #tri-zero collaborators
 ### Upgrade your V0 or build a fresh T0.  
 
 
-## Alpha-3 Release 2022-01-11
+## Alpha-4 Release 2022-01-20
 
-![Front](Renders/alpha-3/front.png)
+![Front](Renders/alpha-4/front.png)
 
-![Iso](Renders/alpha-3/iso.png)
+![Iso](Renders/alpha-4/iso.png)
 
-![Z Drives](Renders/alpha-3/z_drives_front.png)
+![Bottom Iso](Renders/alpha-4/bottom_iso.png)
 
-![picture](Renders/alpha-2/bed_asm_no_bed.png)
+![Iso with skirt](Renders/alpha-4/iso_with_skirt.png)
+
+![Bottom Z](Renders/alpha-4/bottom_z.png)
+
+![Bed Frame](Renders/alpha-2/bed_asm_no_bed.png)
 
 **The goal of the Tri-Zero project is to build a killer V0 with full auto-calibration.**
 
@@ -31,6 +35,22 @@ Join us on the [DoomCube Discord](https://discord.gg/doomcube) to help make this
 
 ### Updates
 
+2022-01-20 Update:
+* T0-Alpha-4 released, with 11 new parts.
+* **Now supports NEMA14 and NEMA17**: use what you've got!
+  * The new MotorSkirts push the motors as far out as possible, freeing up enough space to fit larger power supplies  more easily (between motors or against the motor rear plates).  
+  * The front skirt can be swapped for a [4" touchscreen mod](https://github.com/Fleafa/VoronUsers/tree/V0.1-Trident-skirt/printer_mods/roboticator24/4inch_touchscreen_mount_for_v2.4) for [KlipperScreen](https://github.com/jordanruthe/KlipperScreen).  
+  * Guitar Feet (4x) can be added to give a nice handle with the skirts... or, retain the original V0 bumpers.
+* New rear motor mount: now, mounts to the nuts you'd already have on a V0 if doing a conversion.  This is huge deal!  To convert a V0, you no longer need to dissassemble the rear frame.
+* New clip-in 30mm fan mounts on the sides for side-to-side airflow.
+* New clip-in front motor pulley covers.  Leave them out if you want to see Z motion or put some spinners on.
+* Slightly thinner rear Z idlers: now they fit within the extrusion thickness of 15mm.  Two benefits: more space for a probe back there (hint, hint) and now the center tensioner fits a regular 12mm BHCS, so no cut screw or washers are needed anymore.
+* CAD and STLs for alpha-3 are now available.  The original V0.1 bed assembly is gone, for a smaller file size, but Fusion is failing to export, so .step only for this one.
+* Want to contribute?  PRs would be welcome for these improvements:
+  * Integrated probing solution
+  * Rear side skirts with less material.  Duplicating the front skirts adds unnecesary material and gets in the way of a rear outlet.  I got tired and chose to release this instead of modding the skirt.  Other improvements matter more.
+  * Integated bed Wago mount (5x2)
+
 2022-01-16 Initial BOM posted below.  No large changes are expected, but no promises are made w/an alpha!
 
 2022-01-11 Update:
@@ -66,22 +86,23 @@ Join us on the [DoomCube Discord](https://discord.gg/doomcube) to help make this
 
 ### BOM preview
 
-This BOM preview is for Alpha-3, though there's no expectation that these parts will change.  The BOM will become more specific over time, as more of the design gets tested and finalized.
+This BOM preview is for Alpha-4, though there's no expectation that these parts will change.  The BOM will become more specific over time, as more of the design gets tested and finalized.
 
 | Category | Part | Qty | Notes |
 | - | - | - | - |
 | Fasteners | M2x6 BHCS or SHCS | 10+ | For retaining the Z attachments in rear (2), 6-8 for the rear Z bar, plus one per front idler (2) |
 | Fasteners | M2x8 BHCS or SHCS | 4+ | For retaining the Z belt attachments in front |
 | Fasteners | M2 nuts | 12 | For M2 nutbars
-| Fasteners | M3 BHCS (various) | Yes | For Z idlers (vertical), Z bearing holder (horizontal), + lots more
+| Fasteners | M3 BHCS (various) | Yes | For Z idlers (vertical), Z idler attachments (horizontal), motor mounts, skirts, +lots more
 | Fasteners | M3 nuts | Yes |
-| Fasteners | M3 heatset inserts | Yes | For motors, bed mounts, frame corners and more
+| Fasteners | M3 heatset inserts | Yes | For motors, bed mounts (2 + 3), motor skirts (4x3), z belt attachment (4) and more
 | Z Drives | GT2 belt | 3x~450mm |
 | Z Drives | GT2 16t pulleys | 3 |
 | Z Drives | MGN7H 150mm | 2 | Ideally upgrade to MGN9C on the X carriage and then get only one of these.
 | Z Drives | NEMA14 (for alpha3 or alpha4) or NEMA17 motors (for alpha4, when released) | 3 | Needs to have enough hold torque.  Mid-size (33mm body length) NEMA14 are marginal, while long (48mm body length) NEMA14 or most mid-to-large NEMA17 will provide enough unpowered hold torque to keep the bed from dropping.  Ideally 0.9mm for extra resolution.  Mix and match should be fine.  Use what you've got.  The Z drive motors barely matter.
 | Z Drives | F623 bearings | 6 | Idlers |
 | Bed | Sexbolt endstop kit | 1 + 1 | Needed for Auto-Z, though technically optional, if you use a virtual endstop in Klipper |
+| Frame | Guitar Feet | 4 | Optional; same as used with Voron Trident.  Can use original V0.1 rubber feet instead.
 
 In addition, you'll need parts for a bed probing solution, plus some way to get extra drivers.
 
@@ -97,33 +118,34 @@ It's a collection of early, rapidly-evolving parts, that you can look at, learn
 
 The parts actually work to enable functional triple-bed-leveling, so you can build a working printer with it.
 
-To test the concept as quickly as possible, this release re-uses many parts from other sources, especially [F-Zero](https://github.com/zruncho3d/f-zero). But the 4x Z reduction really isn't needed for a bed that is 1/3 the weight of an F-Zero gantry.
+To test the concept as quickly as possible, early alpha releases re-used many parts from other sources, especially [F-Zero](https://github.com/zruncho3d/f-zero). But the 4x Z reduction really wasn't needed for a bed that is 1/3 the weight of an F-Zero gantry, so at alpha-3, everything moved to direct drive.
 
 Think of it as a functioning work-in-progress in advance of a future T0 beta or actual release.
 
 ### What is missing in the Alpha Release?
 
-What's missing is a final bed probing solution.
+The main missing item is an out-of-the-box bed-probing solution.
 
 There are a number of options out there for bed probing, all under test.  See #tri-zero on the DoomCube discord for the latest.
 
 ### What's in this repo?
 
-In this repo are some of the STLs needed to build a Tri-Zero Alpha.
+In this repo are all of the STLs needed to build a Tri-Zero Alpha which are not in the V0.1 repo.
 
-All parts should be already be in print-ready orientation, and no supports are needed.
+All parts should be already be in print-ready orientation, with seam in the +Y dir, and no supports are needed.
 
 Standard Voron settings, or lowered infill and fewer perims, should work fine for most parts:
 - 4 perimeters
 - 40% infill, depending on the part
 - 0.2mm layer height
 
+The MotorSkirts are happy with 20% infill, for a bit of print speedup.
+
 ### Printed Parts
 
 For printed parts, you need the STLs in the quantites noted from this repo, along with STLs from a bunch of places:
 - [F-Zero](https://github.com/zruncho3d/f-zero): no-drop nuts
 - L.e.o.p.a.rd's endstop assembly - see [F-Zero gdoc for instructions](https://docs.google.com/document/d/1dm8itefYrLIsCcOQht9sdMzrXE8Jk30s56c9IwtRCkM/edit)
-- [MCMBen Trident-style V0 skirts](https://github.com/Fleafa/VoronUsers/tree/V0.1-Trident-skirt/printer_mods/MCMBen/Voron0_Trident_Skirt/STLs)
 - More M2 nutbars from V0
 
 In addition, an MGN9 or dual-MGN7 X gantry is highly recommended!  You don't want toolhead flop to affect bed-probe results or print quality.  Hartk1213 has an [MGN9 mod for V0](https://github.com/Fleafa/VoronUsers/tree/master/printer_mods/hartk1213/Voron0_MGN9C_X_Axis) which is in use in the first prototype.