A)Story (Feel free to skip this): Approximately two weeks ago, on the day designated for my Mechanical Design 2 examination, my drafting table unfortunately broke. So I was forced to complete the exam using freehand techniques, as the university lacked any backup equipment and students were required to provide their own. As a student in Greece, acquiring a new drafting table was prohibitively expensive, especially since I would only need it for one additional use (since CAD is much more advanced). The table I had was a hand-me-down from my retired godfather, dating back to 1989 so it was expected it would fail at some point. This situation prompted me to consider repairing the old table. Ultimately, I undertook the task of 3D modeling and printing each component using my modest $100 Chinese printer. Following this, I engaged in further modeling to transform my replacement parts into a fully operational, entirely 3D-printed drafting table, designed for students and others who find themselves needing to purchase such exorbitantly priced equipment. 

B)Parts Needed: 

1)6 M3 Wood Screw

2)A flat piece of wood with dimensions of 52cmX72cm 

3)4 M3 washers 

5)About 2.7 meters of string 

6)A 60cm Ruler 

RECOMMENDED INFILL: 25%
NOTE: The 3d printed parts are named ..X2 meaning you have to print that file 2 times 
NOTE: Print the step files as they are much higher quality, the stl files have been included as a requirement for the education tools contest

C)Assembly:
1)Take the smooth wooden board and along it's width and the dimension of 72 mark with a pencil a line about 2.3 cm from each side, do that for both sides and using the model BracketX4 as a guide, position is so that it looks like the image below and drill with a 2 mm drill about 80-90% of your screw size. Repeat this step 4 times for each corner. Add a washer to each screw and screw it so that the distance from the bottom of the head head of the screw to the 3d printed part is about 5mm.

2)Now, pick the side you would like to attach the handle and mark the center with a line. Then using the TopHandle  model as a guide drill 2 holes in their respective positions. Finally position the handle at 90 degrees, place the top handle above it and screw it in it's place (Image available below). 

3)Now to assemble the main part of the drafting table take each of the RulerHolders and slide it in a HolderRail (The holder rail is a separate part from ruler holder to cut down on my prototyping process and to maintain compatibility with my original drafting table). Proceed by adding the 2 rollers to each RulerHolder (feel free to lubricate the rollers with something like silicon spray to make their rotation easier). Next, secure them in place by placing a c clip on top of each of them in the appropriate position (the one where the diameter shrinks). Now if you have printed the HolderCaps you can just press them into place. Finally, drill the ruler according to the RulerMockUp file (be careful, you need to be precise with your holes on the ruler). Finally position the ruler between the two assembled Holder rails and position it in place, if it's still wobbly or you don't feel confident in it staining in it's place feel free to add either super glue or hot glue to fix it in place permanently.

4) Cut your string in 2 equal lengths of 1.35m and wind it each as shown in the diagram below making sure there is an equal length of excess string. 
5)Finally, with the ruler assemble leveled on the bottom (see img below) wind each excess of string in the direction of the screw so that once you screw in the string will wind up. 

6)Carefully tighten each screw to the point where the string is visibly tightened (aka it doesn't slack anywhere) but does not present much resistance when  moving the whole middle assembly up and down. 
 

Congratulations, you now have your self a 50$ drafting table for a fraction of the price!

NOTE: Your final part will look like the render image and not like the picture as the one in the picture is the repaired drafting table from my godfather.

If your 3D printer is of inferior quality like mine, and the tolerance for the roller is insufficient, it is advisable not to waste material on printing new rollers. Instead, consider increasing their inner diameter using a hot glue gun to press the nozzle into the inner diameter to enlarge it.