There's a lotta parts to print here so let's start with the fact that if you're in a metric country, you'll want to adjust fastener sizes in the PARAMS spreadsheet in the freecad file.

You're gonna need a bunch of 1/4in hardware:
Nuts - 4
Wing nut - 3
Hex head bolts:
1 at 2.5in
1 at 2in
4 at 1.5 in

Then you'll need some 3/4 in thin walled pipe. I used aluminum deck pickets, but copper pipe should be fine. This is 19mm for you metric folks. This can also be adjusted in the PARAMS spreadsheet if you can't get what you need.

The part called topslider should be printed upright for maximum strength. You need to press a nut into the square slot and put a bolt through it for bracing against the shelf. Make sure to install the bolt and knob in the centre before final assembly of the rails!

The part called central bracket should be printed with its largest face flat on the platform. Install the 2 hex head bolts and knobs before assembling onto the rails.

The endcaps(you should print 4 of these) should be printed with the large holes facing upwards. make sure to put all brackets and sliders onto the rails before installing the end caps. Place 4 small screws into the provided holes for extra rigidity. Make sure to do this on a flat surface to avoid making the rails crooked.

The C clip should be printed with the clip part flat on the bed for maximum strength. It can be installed onto one of the end brackets at the end with 2 hex bolts and wing nuts.

You'll need to print 2 large knobs and 1 small knob.

There is an optional base for screwing into a desk surface if desired.

Report any issues in the comments here. If you're interested in making this in metricland, contact me if you need help editing the model, the only reason it's not available in metric is that I'm not aware of what sizes of bolts and such are commonly available. Be prepared to send me a bunch of measurements!

Print Settings

Rafts:

Doesn't Matter

Supports:

Resolution:

0.2

Infill:

Filament:
Inland PLA+

Notes:

Category: Hobby