v-core 3 Ventermech arms

VenterMech integrated v-core 3 arms

Note, due to licensing requirements from prusaprinters.org the ventermech STLs cannot be posted here. Please contact Liam Venter([email protected]) for them.

Jan 9, 2022: Update - the script now uses the v3 arms which have room for washers under the cap head screws.

The arms are generated using a openSCAD script. The v-core arms used are from https://www.thingiverse.com/thing:5131325 by MFBS and has a https://creativecommons.org/licenses/by-sa/3.0/c license
The VenterMech is from https://www.fastbikegear.co.nz/index.php?main_page=product_info&cPath=0&products_id=12371 by Liam Venter([email protected]) and has a http://creativecommons.org/licenses/by-nc-nd/4.0/?ref=chooser-v1 license

To generate the arms:

• open the "generate vcore arms with ventermech.scad" file
• remove the // in front of one of the lines at the bottom
• then click the "Render" button or press the F6 key (this will take a while)
• then click "Export as STL" button or press the F7 key
• It is important to only do one line at a time, otherwise you will have to separate the bed arms in the generated STL
• Repeat for each line so that you have all 3 bed arms

Recommended printing from creator

The arms with 3 layers and 30% gyroid infill from PETG or ABS
The star drives from PETG, Nylon or ABS (only use ABS for the star drives if you have nice a hot enclosure) at 100% infill.

VenterMech Bom
 

10 x washers for 3 mm diameter cap screws OD approximately 6.8 mm x 0.6mm thick.
2 x 3mm x 40mm cap screws for the 2 lower cap screws on rear bed arm.
4 x M3 x 25 Cap screws (two of the cap screws mounting the front arms to the carriages are longer than the original arms to make the connection more rigid)
3 x F10-18M thrust bearings 10 ID  x 18 OD x 5.5 Height.

Important: The upper and lower bearing races are flipped in the assembly of the  VeterMech so that the bearings run on the flat side of these races.

These are available from most bearing suppliers and can be purchased online from amazon and aliexpress. Just search for F10-18M to find them.

https://www.aliexpress.com/item/32911485541.html?spm=a2g0o.store_pc_allProduct.8148356.1.d9b947ed4WW4DI

Printing Instructions

Print the arms with 3 perimeters and 30% gyroid infill from PETG, ePAHT-CF or ABS
Print the star drives with 3 perimeters and 100% infill, from PETG or ABS
Make sure that your star run freely on the lead screw.

Assembly
Move your front linear rails from the inside faces of the front vertical extrusions to the rear face of the front vertical extrusions. You do not need to modify or move any other parts of your printer to do this.
It is usual for one of the thrust bearing races to have a slighly larger ID (Internal Diameter) than than the other. Place the one with the larger ID into the recepatacle first so that the flat side of the bearing race faces the bearing  and the indented side face the VenterMech receptacle.
Place the bearing assembly into the receptacle. Apply a thin smear of lube on this.
Place the second bearing race (with the slightly smaller ID) in the receptacle so that the flat sides of the bearing race faces the bearing and the indented side face the VenterMech star drive.
Install the VenterMech star drive.

It is critical that the flat sides of the bearing races face the bearing assembly. 
If you place the grooved side against the bearing assembly this will constrict the movement of the bearing assembly.

Feedback
I (Liam Venter - [email protected]) love feedback.
Let me know how you get on.
Remember to post up your before and after photos of prints on the forum where you first heard about the VenterMechs.