Drew's Open Art Printing Press Improvements - V1.1

Thanks to Martin Schneider for his great design of the Original Open Press Project.
https://www.thingiverse.com/thing:2841592 and https://openpressproject.com/

Thank you to Hefrimu who created a load of improvement to form the Open Art Press: https://www.printables.com/model/39653-open-art-press  Which includes stronger gear teeth, use of helical gears, and an improved handle.

Nevertheless I found a few ways to improve on these already excellent projects, by creating the following refinements v1.1. 

1. New Knobs - for the top of the press screws.
2. Changing to standard hardware - To make it easier to assemble without needing to customise metal parts. And creating the hardware list below.
3. Longer Print Table 189mm - I didn't do any new CAD here, I just arranged 2 tables carefully onto the print bed and printed them as 1 object. 
4. Simplified Top Roller - removes the ball bearing groove, I found that ball bearings are not needed.
5. New Handle - Micro tweaks to improve tolerances.

Hardware List - for Open Art Press v1.1

For the Press screws (see the photos for how these assemble):

• 2 off M5 by 50mm hex head bolts as the press screws 
• 2 off M5 Nut pressed into the frame 
• 2 off M5 Dome head nuts
• 2 off M4 Washers push or glue into the to top of the roller carrier, to receive the dome nuts. 

To fix the frame together:

• 4 off M2 by 8mm Philips head Self Tapping Screws - to fix on the name plates and hold the frame together.
• 1 off M4 by 35mm Cap head bolt -  to fix the top of the frame together.
• 1 off M4 Nut

To fix the handle together:

• 3 off (size to check) wood screws to fix on the handle and lower roller.

Printing Instructions

• Printed in PETG with 0.2mm layer thickness 50% infill and  4 walls, top and bottom.
• PETG can be sanded a lot better than PLA to create a better final surface.
• On an Ender3 it takes about 1.5 to 2 days to print all the parts.
• The lower roller is the only part that I used support for, to hold up the gear teeth.

Assembly

• I found a couple of hours of careful sanding was needed to make the running surfaces clean and smooth. 
• I used a white lithium grease from my bike tool kit on the bearing surfaces.

Compatibility

• All v1.1 parts are fully compatible drop in replacements to the Hefrimu Open Art Press.
• Only the knobs  are compatible with the Original Schneider Open Printing Press.

I've got a whole load more refinements to make, so I will do some more updates at at some point.