Frame for glass bottle cutter.

It's a frame to hold an engraving tool to cut round glass objects. 

This is the first prototype.

I only updated the back-end plate (file "Bottle_cutter_slider_02" and see photos), now it is more rigid but its purpose is not to prevent the bottle from sliding horizontally it's only a reference for cutting. I also put a link with examples of silicone bands to mount on the rollers.

I had other improvements in mind but unfortunately I can't find some parts of the project on Tinkercad anymore, I don't know if I'll find the time to reconstruct the original drawings with the relative references.

Hardware required for assembly:

• 4 x M3 nuts
• 4 x M3x15 mm countersunk head screws
• 6 x M4 nuts
• 4 x M4x10 mm countersunk head screws
• 2 x M4x35 mm exagonal head screws
• 1 x M6 nuts
• 1 x M6x45 mm exagonal head screws
• 4 x ⌀3 x 55mm steel pins
• Silicone rubber band

Note: the project you see in the photos uses rollers that I took from a plotter while in the print files are loaded cylinders of equal diameter to which you need to insert a 3 mm diameter bar as a pin to obtain the rollers.
The pin must be bent and fixed in the side hook on one of the roller supports.

I suggest covering the rollers with rubber so that they have more friction on the glass. You can use a heat-shrinking sheath or a printed cover in soft TPU (print file not present) but silicone rubber band would be great.

A stiff metal plate could be attached in the side stop in order to make it more reliable.

Using the holes in the arm it can also be adapted to hold a variety of tools. You can design it on your needs.