Bear MK3/3.5 with 10mm Z-rods (MK4 look)
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10mm Z-rods mod for MK3/3.5, to give a MK4 look to your printer :)
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Aktualizacja u źródła:
Informacje o modelu
- Źródło
- Printables
- Kategoria
- Prusa Parts & Upgrades
- Licencja
- GNU General Public License v3.0
MK3-Bear conversion to 10mm rods, to give it a MK4 look. There’s likely no reason for this upgrade apart from the cosmetics, the 10mm rods certainly bring more stiffness but I’m not sure it gives any print improvement. This mod fits MK3.5, MK3.5S, and legacy MK3S and MK3S+ (maybe the previous versions as well, I’m not sure!). This mod passes the X/Y/Z calibration fine since all dimensions from the MK3 are kept (only looks like the MK4!).
In my case I have put the 10mm rods in my MK3.5S-Bear:
I have re-modeled the original parts from the Bear upgrade and also from Prusa MK3S/+, bringing the MK4 appearance to it and fitting the 10mm rod, but still being "plug-play" to the MK3 models. See below some details.
Comparison to Original Bear Upgrade and Original Prusa MK3/S/+ parts:
Z-motor mounts
- Based of Bear Upgrade part;
- Updated rod support from 8mm to 10mm;
- Thicker upper section;
- Changed fixation from 2 screws to 4 screws.
Z-tops
- Based of Bear Upgrade part;
- Updated rod support from 8mm to 10mm;
- Thicker upper section;
X-idler end
- Completely redesigned with MK4 appearance;
- All “must-have” dimensions carried-over from MK3S+ part (rods center-to-center distance, heights equal to the MK3/MK3.5, etc);
X-motor end
- Completely redesigned with MK4 appearance;
- All “must-have” dimensions carried-over from MK3S+ part (rods center-to-center distance, heights equal to the MK3/MK3.5, etc);
PS: If you’re building the MK3.5 with Bear Frame from the very beginning, you must read this first: Bear Upgrade for Prusa (i3) MK4(S), MK3.5(S), MK3.9(S)
BOM – Bill of Material
The parts are similar to the MK3.9/MK4 BOM, but you have to source it yourself.
| Parts | Qty | Note |
| Z_TOP_LEFT | 1 | Printable part |
| Z_TOP_RIGHT | 1 | Printable part |
| Z_MOTOR_MOUNT_LEFT | 1 | Printable part |
| Z_MOTOR_MOUNT_RIGHT | 1 | Printable part |
| X_MOTOR_END | 1 | Printable part |
| X_IDLER_END | 1 | Printable part |
| X-end-clip-R2 | 2 | Printable part, same part as the Original MK3.9/MK4 file |
| Smooth rod 10mm (L = 320mm) | 2 | To replace the 8mm Z-rods |
| LM10LUU linear bearing | 2 | To replace the 4x LM8UU bearings on Z-axis |
| Rubber pad 20x10x1 mm | 4 | To be mounted inside X-end-clips |
| M3x30 screw | 6 | For X-end-clips |
| M3x18 screw | 2 | For X-end-clip on X_IDLER_END |
| M3x25 screw | 1 | Tensioner for X-motor |
| M3x10 screw | 1 | Tensioner for X-motor (touching motor) |
| M3nS (square) nut | 7 | 3 for X_MOTOR_END, 4 for X_IDLER_END |
| M3 nut | 6 | 4 for X_MOTOR_END, 3 for X_IDLER_END |
| Rubber pad 42x42x2 mm | 2 | With the Z-axis motor "face" shape |
| M3x10 screw | 4 | For POM nuts fixations (previous M3x18 will be discarded) |
| M5x10 screw (pan head) | 4 | For 2x new added holes on the Z-motor mounts on each side |
| M5 T-nut | 4 | For 2x new added holes on the Z-motor mounts on each side |
Assembly:
Once you disassemble the Z and X axes, all instructions are pretty much the same as the Original MK3.9/MK4. You can follow the official instructions from Prusa (considering of course the few modifications of this mod):
- 3. X-axis & X-carriage assembly - Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade3. X-axis & X-carriage assembly
- 4. Z-axis assembly - Original Prusa i3 MK3/MK3S/MK3S+ to MK4S/MK3.9S upgrade / 4. Z-axis assembly
Credits
Bear Upgrade as created by Grégoire Saunier. Based on 2.1.1 (Bear Upgrade) source files.
Bear Upgrade for Prusa (i3) MK4(S), MK3.5(S), MK3.9(S) by DCS21.