This thing is inspired from this one: http://www.thingiverse.com/thing:999840. I had the same problem as i just bought a diamond hot end for my hephestos prusa I3.
He gave me the idea of recycling some stuffs i had at home:
- a curtain rail for the main support
- copper pipes for the axis
- PVC pipes for the rollers.
To give other the possibility to do the same with little work i designed it customizable with OpenSCAD. You may be able to customize it for stuffs you have already even if they are different than mine.
STL files are given as an example, I bet they won't fit your materials. You must customize it for this.
Supports are mandatory for the links, no supports are needed for other parts.
How to customize it ?
You won't be able to customize it with thingiverse applications because they can handle only 1 SCAD file and i have 6 main files and 6 utilities files. You must then download and unzip the file
The only file to modify for customisaton is custom-params.scad, it contains all the parameters that control the models of the 6 main files.
The main files are called
SpoolStand-xxxxxxx.scad. They are to be opened for rendering of each part. No modifications should be necessary in these files unless you find a bug or you want to make modifications in the designs.
I will explain in next chapters the usage of every 22 parameters of custom-params.scad file. In the schemas, the dotted lines indicates that we don't care that parts of the objects. All dimensions are given in millimeters.
In order to avoid stuck parts after printing the model includes a gap between parts (ex: gap between axis and the bearings). This gap depends on the printer precision, most of the time half the nozzle size is a good gap value because the gap is often used 2 times between 2 parts.
The printer gap parameter is
PRINTER_GAP. Its default value is half my printer nozzle size (PRINTER_GAP=0.2 for my 0.4mm nozzle).
Your rail must be a rail, meaning it need a hollow part that allow the nut cages to slide into it. I used a recycled curtain rail but you can use 'standard' rails.
The only requirement on this part is to have a pipe and not a filled bar. We need this because the axis must go through it. I used a 40mm PVC discharge pipe for mine.
The easier part. I used a copper pipe but any threaded shaft can do the job. Of course this part must fit in the roller pipe.
Here we need the dimension on the screws and its associated nut you will use to fix the links to the rail.
These parameters are completely arbitrary and not subject to mechanical constraints.
The last parameter is
STOPPER_LENGTH. Stoppers are the extremities of rollers. They go in the roller pipes and this parametetr control how deep they go.