EnderWire / Switchwire — MGN12C Conversion Pack (X, Y & Z carriage parts)
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Drop-in replacements for the EnderWire (Ender 3 → Voron Switchwire conversion) carriage parts, re-drilled for MGN12C lin
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Informacje o modelu
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- Printables
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- Voron Parts & Upgrades
- Licencja
- GNU General Public License v3.0
What is this?
If you are building an EnderWire (the popular Ender 3/Pro/V2/V2 Neo → Voron Switchwire CoreXZ conversion) and you have MGN12C blocks instead of the MGN12H blocks the project calls for, the printed parts won't bolt on correctly: both blocks share the same 20 mm transverse hole spacing, but the longitudinal spacing is 20 mm on the H block vs 15 mm on the C block.
Re-drilling the original holes is not an option — with 3.4 mm holes only 2.5 mm apart, old and new holes would merge into a slot and the screws could not locate the block. Worse, if the holes are even slightly off, tightening the 4 screws side-loads the bearing block and the carriage becomes stiff on the rail (binding). That is exactly the problem this pack fixes.
Each part here is the original EnderWire/Switchwire part with the old 20×20 holes filled with solid material and a fresh 20×15 pattern opened in the exact MGN12C positions (±10 mm transverse, ±7.5 mm longitudinal from the pattern center). Counterbores and chamfers were migrated along with the holes. Everything else — belt paths, joining holes, pockets, outer geometry — is untouched, so the parts remain drop-in compatible with the rest of the build.
Files
File | Replaces | Axis |
|---|---|---|
| Voron SW | X |
| Ender_SW Rev.2 | Y |
| Ender_SW Rev.2 | Y |
| Ender_SW | Z |
| Ender_SW | Z |
| Ender_SW | Z |
How it was done/quality control
The modifications were made with exact boolean operations (Manifold engine) on the original meshes, not by eyeballing:
New hole positions verified by cross-section measurement to within ±0.01 mm of the nominal 20×15 grid.
Old holes confirmed 100 % filled (no slots, no leftover geometry).
All meshes are watertight / manifold — they slice cleanly.
Hole profiles (thread clearance Ø, counterbore Ø and depth, chamfers) replicated from the originals at the new positions.
Hardware notes — read before assembling
MGN12C blocks have short threads (~3.5 mm usable). The screw should engage ~3 mm into the block and must NOT bottom out — a bottomed screw feels tight while the part is still loose. On the Y bed carriage (10 mm wall with ~4.5 mm counterbore) check your screw length carefully; add a thin washer under the head if needed. The Z blocks keep the stock M3×30 (≈3.1 mm engagement ✓); the X bearing block uses M3×8 (≈3 mm engagement ✓).
Tightening procedure matters (especially on the dual-rail Y axis): install everything finger-tight, slide the carriage full travel a few times so the blocks self-align, then torque the screws gradually in a cross pattern while sliding the carriage between steps. This prevents preload/binding.
Heads-up on rigidity: the C block is ~10 mm shorter than the H block and tolerates less moment load. It works fine, but if you ever chase VFA/ringing at high accelerations, upgrading just the X axis to an H block (and reprinting the stock X bearing block) is the cheapest fix.
Print settings: standard Voron spec — ABS/ASA, 0.2 mm layer, 4 perimeters, 40 % infill, no supports.
Credits & license
These are remixes. All credit for the original designs goes to:
- Voron Design — [Voron Switchwire](https://github.com/VoronDesign/Voron-Switchwire) (x_bearing_block and the whole SW platform)
- boubounokefalos / phigri33d / Triano — [Ender_SW / EnderWire conversion](https://github.com/boubounokefalos/Ender_SW) (Y and Z parts, chain mount)
Both are licensed GPL-3.0, and so is this pack. Sources unchanged except for the modifications described above.