I have just built a 3D printer at work and am using cura as the slicer. Today we managed to get the 3d printer to print the test piece using pla. But now am going to print something from solid works. My question is do I have to hollow out the model before I print, or will cura do this for me? If I created a cube how would I create the structure in the model to print it? Hope this makes sense. Many kind regards
Yes set your infill percentage to how ever hollow you want to make it. 15% is 15% filled.
So I design the product in solid works as normal (solid) and set infill to percentage, so if I wanted a strong structural product would 30% 40% be ok? Or greater? And cura would create the model with a honey combed centre? Basically I wanted to create a motor bracket for an RC car. Many thanks for the reply. Much appreciated
You export from solidworks to stl and cura sets the infill from the stl.
I am still amazed that type of 3D printer works. How stable are those arms?
hey this looks nice! is the design open source or availabe in any way?
or which printer is it? where to buy?
@Hakan_Evirgen It looks a lot like an orion delta.
25% is fairly strong. Anything over 50% and you might as well print the object solid. Although this all depends on the infill pattern, I recommend rectilinear or line (Cura defualts to rectilinear so no worries). Also make sure you have the printer profile configured correctly in Cura.
no Orion Delta is different.
Honeycomb fill fattern is stronger than others but prints slower.
@Hakan_Evirgen google influence infill patterns and you will find a study about it, but lineal is the strongest because honeycomb only gives you more inertia at the cost of easier deformation
We’ve found the triangle fill pattern to be stronger than both honeycomb and grid/rectilinear.
You can use triangle fill in MatterControl - not cura.
Technically speaking, the triangle should be more ridged than the honey comb. Ive printed honey comb and hashed from cura, it seemed that shell and layer thickness and hotend temp did the most to make my parts stronger. My stock firm ware printed abs at 205 to 210. Now that I’m printing at 220 layer adhesion and part strength are much improved! 40% infill also helps 
Arms are carbon, and seems strong, it is called a deltic, I believe it was an open source design but changed to suit the designers need. It runs an andrino board. And manufactured in the UK.
Not sure if you can buy one but I can ask the person who manufactures them, he does not make many so cost might be high.
Lastly thank you for your help and interest. How can I change the structure of the support in the middle from square to triangle to honey comb?
the infill is an option in your slicer. There should be numerous options available including honeycomb. Triangle is something I did not see in my slicer.
How do these carriages stay in place?
@Rien_Stouten good question. Looks like the back half missing.
There v-groove wheels and they ride on a plate bolted (i guess) look at the cutout at the bottom
Yes the uprights are pushed through the base plate and bolted to a fixing the the base, the arms are held with rollers which are bolted on to the uprights.
Not sure that makes sense but I will take a better picture.
MatterControl - http://mattercontrol.com - is free, open source printer control software and slicing engine that has triangle fill - as well as hexagon, grid, lines, and concentric fill patterns.